{ "slug": "general-knowledge", "jurisdiction": "US", "name": "CDL General Knowledge", "kind": "general-knowledge", "title": "CDL General Knowledge Practice", "language": "en", "edition": "March 2025", "questionCount": 100, "writtenTest": { "questionsAsked": 50, "correctToPass": 40, "confirmed": { "questionsAsked": false, "correctToPass": false, "passShare": true }, "ruleSource": { "title": "49 CFR 383.135(b)(1) (80 percent to pass a CDL knowledge test)", "url": "https://www.ecfr.gov/current/title-49/subtitle-B/chapter-III/subchapter-B/part-383/subpart-F/section-383.135" }, "note": "Federal rules require at least an 80 percent score on a CDL knowledge test. Fifty general knowledge questions is the common state test size and the practice target here; the real test size and pass mark vary by state." }, "disclaimer": "This is a study aid written by examprepare.help from the AAMVA model Commercial Driver's License Manual (Version March 2025), the model commercial driver's license manual that most states adopt. It is not the real CDL knowledge test, it is not affiliated with FMCSA, AAMVA or any state agency, and your state's test may differ. Check your state driver licensing agency before you take the real test.", "source": { "publisher": "American Association of Motor Vehicle Administrators (AAMVA), distributed by the Oklahoma Department of Public Safety; supported by the Federal Motor Carrier Safety Administration", "title": "Commercial Driver's License Manual, Modernized Testing System", "formNumber": null, "edition": "March 2025", "url": "https://aem-prod.oklahoma.gov/content/dam/service-oklahoma/Documents/CDLDriverManual.pdf", "pageUrl": "https://www.fmcsa.dot.gov/registration/commercial-drivers-license/cdl-manual", "retrieved": "2026-10-05", "textSha256": "1faa1b36ebbfaacdccfc7876fc5e75d02b5ea9d3b852dd22708d70b059c92672", "via": null }, "facts": [ { "key": "front-tread", "label": "Minimum tread depth on front tires", "value": "4/32 inch in every major groove", "section": "2.1.3 – What to Look For", "page": 19 }, { "key": "other-tread", "label": "Minimum tread depth on other tires", "value": "2/32 inch in every major groove", "section": "2.1.3 – What to Look For", "page": 19 }, { "key": "steering-play", "label": "Steering wheel play that is too much", "value": "More than 10 degrees, about 2 inches at the rim of a 20-inch wheel", "section": "2.1.3 – What to Look For", "page": 20 }, { "key": "emergency-equipment", "label": "Required vehicle emergency equipment", "value": "Fire extinguisher, spare fuses, three reflective triangles or six fuses or three liquid flares", "section": "2.1.3 – What to Look For", "page": 21 }, { "key": "air-build", "label": "Air pressure buildup on engine start check", "value": "50 to 90 psi within 3 minutes", "section": "2.1.5 – Seven-step Inspection Method", "page": 22 }, { "key": "hydraulic-leak-test", "label": "Hydraulic brake leak test", "value": "Pump three times, hold firm pressure five seconds; pedal must not move", "section": "2.1.5 – Seven-step Inspection Method", "page": 25 }, { "key": "cargo-securement", "label": "Cargo securement inspection interval", "value": "Within the first 50 miles, then every 150 miles or 3 hours", "section": "2.1.6 – Inspection during a Trip", "page": 25 }, { "key": "warning-devices-divided", "label": "Warning device placement on a divided highway", "value": "10 feet, 100 feet, and 200 feet toward approaching traffic", "section": "2.5.2 – Communicating Your Presence", "page": 30 }, { "key": "warning-devices-hill", "label": "Warning device placement behind an obstruction", "value": "Move the rearmost triangle back up to 500 feet", "section": "2.5.2 – Communicating Your Presence", "page": 31 }, { "key": "perception-time", "label": "Average perception time of an alert driver", "value": "1¾ seconds", "section": "2.6.1 – Stopping Distance", "page": 32 }, { "key": "braking-55", "label": "Braking distance at 55 mph, dry pavement", "value": "About 216 feet", "section": "2.6.1 – Stopping Distance", "page": 32 }, { "key": "stopping-55", "label": "Total minimum stopping distance at 55 mph", "value": "419 feet", "section": "2.6.1 – Stopping Distance", "page": 32 }, { "key": "wet-reduce", "label": "Speed reduction on a wet road", "value": "About one-third, for example 55 to about 35 mph", "section": "2.6.2 – Matching Speed to the Road Surface", "page": 33 }, { "key": "black-ice", "label": "Black ice", "value": "A thin clear layer of ice that makes the road look wet", "section": "2.6.2 – Matching Speed to the Road Surface", "page": 33 }, { "key": "curve-braking", "label": "Why braking in a curve is dangerous", "value": "It is easier to lock the wheels and skid", "section": "2.6.3 – Speed and Curves", "page": 33 }, { "key": "follow-below-40", "label": "Following distance below 40 mph", "value": "One second for each 10 feet of vehicle length", "section": "2.7.1 – Space Ahead", "page": 34 }, { "key": "follow-above-40", "label": "Following distance above 40 mph", "value": "One second for each 10 feet, plus one more second", "section": "2.7.1 – Space Ahead", "page": 35 }, { "key": "phone-disqualification", "label": "CDL disqualification for hand-held phone convictions", "value": "60 days for a second offense in three years, 120 days for three or more", "section": "2.9.4 – Cell/Mobile Phones", "page": 40 }, { "key": "texting-odds", "label": "Texting crash odds", "value": "23.2 times greater odds of a safety-critical event", "section": "2.9.5 – Texting", "page": 41 }, { "key": "night-beams", "label": "How far headlights let you see at night", "value": "About 250 feet with low beams, 350 to 500 feet with high beams", "section": "2.11.4 – Vehicle Factors", "page": 45 }, { "key": "dim-lights", "label": "Distance at which to dim headlights", "value": "Within 500 feet of an oncoming or followed vehicle", "section": "2.11.5 – Night Driving Procedures", "page": 45 }, { "key": "fatigue-sleep", "label": "Sleep that triples crash risk", "value": "6 hours or less", "section": "2.11.2 – Driver Factors", "page": 44 }, { "key": "hot-tires-check", "label": "Hot weather tire check interval", "value": "Every 2 hours or every 100 miles", "section": "2.14.1 – Vehicle Checks", "page": 47 }, { "key": "hot-tire-cool", "label": "Handling a tire too hot to touch", "value": "Remain stopped until it cools; do not let air out", "section": "2.14.1 – Vehicle Checks", "page": 48 }, { "key": "rr-stop-distance", "label": "Stop distance at a railroad crossing", "value": "No closer than 15 feet or more than 50 feet from the nearest rail", "section": "2.15.2 – Warning Signs and Devices", "page": 49 }, { "key": "rr-clear-time", "label": "Time to clear railroad tracks", "value": "At least 14 seconds for a single track, more than 15 seconds for a double track", "section": "2.15.5 – Crossing the Tracks", "page": 50 }, { "key": "downgrade-braking", "label": "Proper downgrade braking technique", "value": "Apply to feel a definite slowdown, release about 5 mph below safe speed", "section": "2.16.4 – Proper Braking Technique", "page": 51 }, { "key": "abs-required-dates", "label": "ABS required by build date", "value": "Truck tractors with air brakes after March 1, 1997; other air brake vehicles after March 1, 1998", "section": "2.18.2 – Vehicles Required to Have Antilock Braking Systems", "page": 54 }, { "key": "liver-rate", "label": "Rate the liver processes alcohol", "value": "About one-third of an ounce per hour, roughly one drink per hour", "section": "2.22.1 – Alcohol and Driving", "page": 58 }, { "key": "hazmat-placards", "label": "Placards required on a placarded vehicle", "value": "At least four identical placards on front, rear, and both sides", "section": "2.23.3 – Lists of Regulated Products", "page": 61 } ], "questions": [ { "id": "general-knowledge-001", "number": 1, "section": "2.1.1 – Why Inspect", "stem": "What is the most important reason for doing a vehicle inspection?", "choices": [ "Safety for yourself and other road users", "To avoid paying tolls", "To improve fuel mileage", "To keep the cab clean" ], "answer": 0, "explanation": "The manual says safety is the most important reason you inspect your vehicle, for yourself and for other road users.", "source": { "section": "2.1.1 – Why Inspect", "page": 19, "printedPage": "2-1" } }, { "id": "general-knowledge-002", "number": 2, "section": "2.1.3 – What to Look For", "stem": "You need at least how much tread depth in every major groove on the front tires of a commercial vehicle?", "choices": [ "4/32 inch", "2/32 inch", "1/8 inch", "3/16 inch" ], "answer": 0, "explanation": "The manual requires at least 4/32-inch tread depth in every major groove on front tires.", "source": { "section": "2.1.3 – What to Look For", "page": 19, "printedPage": "2-1", "fact": "front-tread" } }, { "id": "general-knowledge-003", "number": 3, "section": "2.1.3 – What to Look For", "stem": "You need at least how much tread depth in every major groove on tires other than the front tires?", "choices": [ "2/32 inch", "4/32 inch", "1/4 inch", "3/32 inch" ], "answer": 0, "explanation": "The manual requires at least 2/32 inch of tread depth on tires other than the front tires.", "source": { "section": "2.1.3 – What to Look For", "page": 19, "printedPage": "2-1", "fact": "other-tread" } }, { "id": "general-knowledge-004", "number": 4, "section": "2.1.3 – What to Look For", "stem": "How much steering wheel play is too much and can make a vehicle hard to steer?", "choices": [ "More than 10 degrees", "More than two degrees", "More than 45 degrees", "More than 90 degrees" ], "answer": 0, "explanation": "Steering wheel play of more than 10 degrees, about 2 inches at the rim of a 20-inch wheel, can make it hard to steer.", "source": { "section": "2.1.3 – What to Look For", "page": 20, "printedPage": "2-2", "fact": "steering-play" } }, { "id": "general-knowledge-005", "number": 5, "section": "2.1.3 – What to Look For", "stem": "Which of these is the required emergency equipment for a commercial vehicle?", "choices": [ "A fire extinguisher, spare electrical fuses, and warning devices", "A spare tire, a jack, and a tow chain", "A first aid kit, water, and a flare gun", "A CB radio, a flashlight, and a blanket" ], "answer": 0, "explanation": "The manual lists a fire extinguisher, spare electrical fuses unless the vehicle has circuit breakers, and warning devices for parked vehicles.", "source": { "section": "2.1.3 – What to Look For", "page": 21, "printedPage": "2-3", "fact": "emergency-equipment" } }, { "id": "general-knowledge-006", "number": 6, "section": "2.1.5 – Seven-step Inspection Method", "stem": "During the engine start check, air pressure should build from 50 to 90 psi within what time?", "choices": [ "3 minutes", "30 seconds", "10 minutes", "45 seconds" ], "answer": 0, "explanation": "The manual says air pressure should build from 50 to 90 psi within 3 minutes.", "source": { "section": "2.1.5 – Seven-step Inspection Method", "page": 22, "printedPage": "2-4", "fact": "air-build" } }, { "id": "general-knowledge-007", "number": 7, "section": "2.1.5 – Seven-step Inspection Method", "stem": "What should the anti-lock braking system indicator light do if the ABS is working properly?", "choices": [ "Come on briefly at start-up and then go out", "Stay on the whole time the engine runs", "Flash rapidly all trip", "Never come on at all" ], "answer": 0, "explanation": "The ABS indicator light should come on when the engine starts and then turn off; if it stays on, the ABS is not working properly.", "source": { "section": "2.1.5 – Seven-step Inspection Method", "page": 22, "printedPage": "2-4" } }, { "id": "general-knowledge-008", "number": 8, "section": "2.1.5 – Seven-step Inspection Method", "stem": "How do you test a hydraulic brake system for leaks during the inspection?", "choices": [ "Pump the pedal three times, then hold firm pressure for five seconds", "Pump the pedal ten times and let it drop to the floor", "Hold the pedal down for one minute with the engine off", "Release the parking brake and roll forward" ], "answer": 0, "explanation": "The manual says to pump the brake pedal three times, apply firm pressure, hold for five seconds, and the pedal should not move.", "source": { "section": "2.1.5 – Seven-step Inspection Method", "page": 25, "printedPage": "2-7", "fact": "hydraulic-leak-test" } }, { "id": "general-knowledge-009", "number": 9, "section": "2.1.6 – Inspection during a Trip", "stem": "When transporting cargo, when must you inspect the cargo securement during a trip?", "choices": [ "Within the first 50 miles, then every 150 miles or every 3 hours", "Only at the start and end of the trip", "Every 500 miles or once a day", "Whenever you stop for fuel" ], "answer": 0, "explanation": "Drivers transporting cargo must inspect securement within the first 50 miles and every 150 miles or 3 hours, whichever comes first.", "source": { "section": "2.1.6 – Inspection during a Trip", "page": 25, "printedPage": "2-7", "fact": "cargo-securement" } }, { "id": "general-knowledge-010", "number": 10, "section": "2.2.1 – Accelerating", "stem": "What should you do to keep from rolling back when you start on a hill?", "choices": [ "Partly engage the clutch before taking your foot off the brake", "Release the parking brake first and then start", "Rev the engine and release the clutch quickly", "Shift into a high gear before moving" ], "answer": 0, "explanation": "With a manual transmission, partly engage the clutch before taking your right foot off the brake, and use the parking brake whenever necessary.", "source": { "section": "2.2.1 – Accelerating", "page": 26, "printedPage": "2-8" } }, { "id": "general-knowledge-011", "number": 11, "section": "2.2.4 – Backing Safely", "stem": "Why should you back and turn toward the driver's side whenever possible?", "choices": [ "You can see the rear of the vehicle by looking out the side window", "It is the only legal way to back up", "It puts more weight on the drive axles", "It uses less fuel than backing to the right" ], "answer": 0, "explanation": "Backing toward the driver's side lets you watch the rear of your vehicle by looking out the side window, while backing to the right is very dangerous.", "source": { "section": "2.2.4 – Backing Safely", "page": 27, "printedPage": "2-9" } }, { "id": "general-knowledge-012", "number": 12, "section": "2.2.4 – Backing Safely", "stem": "Where should a helper stand while you back your vehicle?", "choices": [ "Near the back of the vehicle where you can see the helper", "Directly behind the trailer", "At the driver's door", "In front of the vehicle" ], "answer": 0, "explanation": "The helper should stand near the back of the vehicle where you can see the helper, and you should agree on hand signals including one for stop.", "source": { "section": "2.2.4 – Backing Safely", "page": 27, "printedPage": "2-9" } }, { "id": "general-knowledge-013", "number": 13, "section": "2.3.1 – Manual Transmissions", "stem": "Most heavy vehicles with unsynchronized manual transmissions require what shifting method?", "choices": [ "Double clutching", "Floating the gears without the clutch", "Skipping every other gear", "Holding the clutch down while braking" ], "answer": 0, "explanation": "The manual says unsynchronized manual transmissions require double clutching to change gears.", "source": { "section": "2.3.1 – Manual Transmissions", "page": 27, "printedPage": "2-9" } }, { "id": "general-knowledge-014", "number": 14, "section": "2.3.1 – Manual Transmissions", "stem": "What gear should you be in before you start down a long, steep hill?", "choices": [ "A low enough gear, usually lower than the gear needed to climb the hill", "The highest gear the vehicle will pull", "Neutral, so the brakes can be used alone", "The same gear you would use on level ground" ], "answer": 0, "explanation": "Shift down before starting down the hill and make sure you are in a low enough gear, usually lower than the gear required to climb the same hill.", "source": { "section": "2.3.1 – Manual Transmissions", "page": 27, "printedPage": "2-9" } }, { "id": "general-knowledge-015", "number": 15, "section": "2.3.1 – Manual Transmissions", "stem": "When should you downshift before entering a curve?", "choices": [ "Before entering the curve, so you can use some power through it", "In the middle of the curve while turning", "Just after you exit the curve", "Never, because curves require a higher gear" ], "answer": 0, "explanation": "Slow to a safe speed and downshift to the right gear before entering the curve so you can use some power through the curve.", "source": { "section": "2.3.1 – Manual Transmissions", "page": 28, "printedPage": "2-10" } }, { "id": "general-knowledge-016", "number": 16, "section": "2.3.4 – Retarders", "stem": "Which wheels does a retarder apply braking power to?", "choices": [ "The drive wheels only", "The front wheels only", "All wheels equally", "The trailer wheels only" ], "answer": 0, "explanation": "The manual says when turned on, retarders apply their braking power to the drive wheels only.", "source": { "section": "2.3.4 – Retarders", "page": 28, "printedPage": "2-10" } }, { "id": "general-knowledge-017", "number": 17, "section": "2.3.4 – Retarders", "stem": "When must you turn a retarder off?", "choices": [ "Whenever the road is wet, icy, or snow covered", "Whenever you are on a downgrade", "Whenever the engine is at governed rpm", "Whenever you are pulling a trailer" ], "answer": 0, "explanation": "When the drive wheels have poor traction the retarder may cause them to skid, so turn it off when the road is wet, icy, or snow covered.", "source": { "section": "2.3.4 – Retarders", "page": 28, "printedPage": "2-10" } }, { "id": "general-knowledge-018", "number": 18, "section": "2.4.1 – Seeing Ahead", "stem": "How far ahead should most good drivers look?", "choices": [ "At least 12 to 15 seconds", "At least 2 to 3 seconds", "At least 30 to 45 seconds", "At least one mile regardless of speed" ], "answer": 0, "explanation": "Most good drivers look at least 12 to 15 seconds ahead, which is about one block at low speeds and about a quarter mile at highway speeds.", "source": { "section": "2.4.1 – Seeing Ahead", "page": 28, "printedPage": "2-10" } }, { "id": "general-knowledge-019", "number": 19, "section": "2.4.2 – Seeing to the Sides and Rear", "stem": "When can mirrors be accurately adjusted on a combination vehicle?", "choices": [ "Only when the trailer or trailers are straight", "Only when the vehicle is loaded", "Only while driving on a straight road", "Only when the engine is off" ], "answer": 0, "explanation": "Mirror adjustment should be checked before a trip and can only be checked accurately when the trailer or trailers are straight.", "source": { "section": "2.4.2 – Seeing to the Sides and Rear", "page": 29, "printedPage": "2-11" } }, { "id": "general-knowledge-020", "number": 20, "section": "2.4.2 – Seeing to the Sides and Rear", "stem": "How do objects appear in a convex mirror compared with looking at them directly?", "choices": [ "Smaller and farther away", "Larger and closer", "The same size and distance", "Upside down" ], "answer": 0, "explanation": "Everything appears smaller in a convex mirror and seems farther away than it really is, so you must allow for that.", "source": { "section": "2.4.2 – Seeing to the Sides and Rear", "page": 29, "printedPage": "2-11" } }, { "id": "general-knowledge-021", "number": 21, "section": "2.5.1 – Signal Your Intentions", "stem": "Which of these is one of the three good rules for using turn signals?", "choices": [ "Signal early, signal continuously, and cancel the signal when done", "Signal only when traffic is present", "Signal after you begin the turn", "Use hand signals at night instead" ], "answer": 0, "explanation": "The three rules are to signal early, keep the signal on until the turn is completed, and cancel it afterward.", "source": { "section": "2.5.1 – Signal Your Intentions", "page": 30, "printedPage": "2-12" } }, { "id": "general-knowledge-022", "number": 22, "section": "2.5.2 – Communicating Your Presence", "stem": "How can you warn drivers behind you that you need to slow down?", "choices": [ "Light taps on the brake pedal to flash the brake lights", "Wave your arm out the window", "Turn on your hazard flashers only after stopping", "Sound a long blast on the horn" ], "answer": 0, "explanation": "A few light taps on the brake pedal, enough to flash the brake lights, warn following drivers that you are slowing down.", "source": { "section": "2.5.2 – Communicating Your Presence", "page": 30, "printedPage": "2-12" } }, { "id": "general-knowledge-023", "number": 23, "section": "2.5.2 – Communicating Your Presence", "stem": "Why should you never signal other drivers that it is safe to pass?", "choices": [ "You could cause a crash and be blamed for it", "It is against the laws of every state", "It makes other drivers angry", "It is only allowed in daylight" ], "answer": 0, "explanation": "The manual warns that you should not direct traffic; you could cause an accident, be blamed, and it could cost you thousands of dollars.", "source": { "section": "2.5.2 – Communicating Your Presence", "page": 30, "printedPage": "2-12" } }, { "id": "general-knowledge-024", "number": 24, "section": "2.5.2 – Communicating Your Presence", "stem": "On a divided highway, where should you place warning devices if you must stop?", "choices": [ "10 feet, 100 feet, and 200 feet toward the approaching traffic", "10 feet, 50 feet, and 100 feet toward the approaching traffic", "10 feet, 100 feet, and 200 feet away from the traffic", "Only at the rear of the vehicle" ], "answer": 0, "explanation": "On a one-way or divided highway, place warning devices 10 feet, 100 feet, and 200 feet toward the approaching traffic.", "source": { "section": "2.5.2 – Communicating Your Presence", "page": 30, "printedPage": "2-12", "fact": "warning-devices-divided" } }, { "id": "general-knowledge-025", "number": 25, "section": "2.5.2 – Communicating Your Presence", "stem": "If your stopped vehicle is hidden by a hill or curve, where should the rearmost warning device go?", "choices": [ "Back down the road up to 500 feet so drivers get warning in time", "Directly at the rear bumper", "On top of the vehicle", "It does not need to be moved" ], "answer": 0, "explanation": "If a hill, curve, or other obstruction prevents drivers from seeing the vehicle within 500 feet, move the rearmost triangle back down the road.", "source": { "section": "2.5.2 – Communicating Your Presence", "page": 31, "printedPage": "2-13", "fact": "warning-devices-hill" } }, { "id": "general-knowledge-026", "number": 26, "section": "2.6.1 – Stopping Distance", "stem": "Which three distances add up to total stopping distance?", "choices": [ "Perception distance, reaction distance, and braking distance", "Perception distance, acceleration distance, and skid distance", "Reaction distance, brake lag distance, and following distance", "Sight distance, passing distance, and braking distance" ], "answer": 0, "explanation": "Perception distance plus reaction distance plus braking distance equals total stopping distance.", "source": { "section": "2.6.1 – Stopping Distance", "page": 32, "printedPage": "2-14" } }, { "id": "general-knowledge-027", "number": 27, "section": "2.6.1 – Stopping Distance", "stem": "What is the average perception time for an alert driver?", "choices": [ "1 3/4 seconds", "3/4 second", "1 second", "2 1/2 seconds" ], "answer": 0, "explanation": "The average perception time for an alert driver is 1 3/4 seconds, which accounts for 142 feet traveled at 55 mph.", "source": { "section": "2.6.1 – Stopping Distance", "page": 32, "printedPage": "2-14", "fact": "perception-time" } }, { "id": "general-knowledge-028", "number": 28, "section": "2.6.1 – Stopping Distance", "stem": "At 55 mph on dry pavement with good brakes, about how far does the vehicle travel while braking?", "choices": [ "216 feet", "142 feet", "61 feet", "419 feet" ], "answer": 0, "explanation": "At 55 mph on dry pavement with good brakes, braking distance is about 216 feet.", "source": { "section": "2.6.1 – Stopping Distance", "page": 32, "printedPage": "2-14", "fact": "braking-55" } }, { "id": "general-knowledge-029", "number": 29, "section": "2.6.1 – Stopping Distance", "stem": "At 55 mph, the total minimum stopping distance is at least how far?", "choices": [ "419 feet", "216 feet", "300 feet", "1,000 feet" ], "answer": 0, "explanation": "At 55 mph the total stopping distance is a minimum of 419 feet, including perception, reaction, and braking distance.", "source": { "section": "2.6.1 – Stopping Distance", "page": 32, "printedPage": "2-14", "fact": "stopping-55" } }, { "id": "general-knowledge-030", "number": 30, "section": "2.6.1 – Stopping Distance", "stem": "How does an empty truck compare with a loaded truck in stopping distance?", "choices": [ "An empty truck requires a greater stopping distance", "An empty truck stops in half the distance", "The stopping distance is the same", "Only the reaction distance changes" ], "answer": 0, "explanation": "Empty trucks require greater stopping distances because an empty vehicle has less traction.", "source": { "section": "2.6.1 – Stopping Distance", "page": 33, "printedPage": "2-15" } }, { "id": "general-knowledge-031", "number": 31, "section": "2.6.2 – Matching Speed to the Road Surface", "stem": "On a wet road, how much should you reduce your speed?", "choices": [ "By about one-third, for example from 55 to about 35 mph", "By about one-tenth", "By half, to about 28 mph", "You do not need to reduce speed" ], "answer": 0, "explanation": "The manual says to reduce speed by about one-third on a wet road, for example slow from 55 to about 35 mph.", "source": { "section": "2.6.2 – Matching Speed to the Road Surface", "page": 33, "printedPage": "2-15", "fact": "wet-reduce" } }, { "id": "general-knowledge-032", "number": 32, "section": "2.6.2 – Matching Speed to the Road Surface", "stem": "Hydroplaning can occur at speeds as low as 30 mph when which condition is present?", "choices": [ "There is a lot of water on the road and the tires are low or worn", "The road is dry and the tires are new", "The outside temperature is below freezing", "The vehicle is heavily loaded" ], "answer": 0, "explanation": "Hydroplaning can occur as low as 30 mph if there is a lot of water, and it is more likely when tire pressure is low or tread is worn.", "source": { "section": "2.6.2 – Matching Speed to the Road Surface", "page": 33, "printedPage": "2-15" } }, { "id": "general-knowledge-033", "number": 33, "section": "2.6.2 – Matching Speed to the Road Surface", "stem": "What is black ice?", "choices": [ "A thin, clear layer of ice that makes the road look wet", "Ice that is mixed with salt", "Frozen slush that looks white", "A dark-colored anti-icing chemical" ], "answer": 0, "explanation": "Black ice is a thin layer clear enough to see the road underneath it, and it makes the road look wet.", "source": { "section": "2.6.2 – Matching Speed to the Road Surface", "page": 33, "printedPage": "2-15", "fact": "black-ice" } }, { "id": "general-knowledge-034", "number": 34, "section": "2.6.3 – Speed and Curves", "stem": "Why is braking in a curve dangerous?", "choices": [ "It is easier to lock the wheels and cause a skid", "It makes the steering lighter", "It always causes the vehicle to roll over", "It reduces the weight on the trailer" ], "answer": 0, "explanation": "Braking in a curve is dangerous because it is easier to lock the wheels and cause a skid, so slow down before the curve.", "source": { "section": "2.6.3 – Speed and Curves", "page": 33, "printedPage": "2-15", "fact": "curve-braking" } }, { "id": "general-knowledge-035", "number": 35, "section": "2.6.7 – Roadway Work Zones", "stem": "What is the number one cause of injury and death in roadway work zones?", "choices": [ "Speeding traffic", "Falling tools", "Poor lighting", "Loud equipment" ], "answer": 0, "explanation": "The manual states that speeding traffic is the number one cause of injury and death in roadway work zones.", "source": { "section": "2.6.7 – Roadway Work Zones", "page": 34, "printedPage": "2-16" } }, { "id": "general-knowledge-036", "number": 36, "section": "2.7.1 – Space Ahead", "stem": "At speeds below 40 mph, how much following distance should you keep?", "choices": [ "At least one second for each 10 feet of vehicle length", "At least one second total", "At least two seconds for each 10 feet of vehicle length", "One vehicle length for each 10 mph" ], "answer": 0, "explanation": "Below 40 mph you need at least one second for each 10 feet of vehicle length, and you must add one more second above 40 mph.", "source": { "section": "2.7.1 – Space Ahead", "page": 34, "printedPage": "2-16", "fact": "follow-below-40" } }, { "id": "general-knowledge-037", "number": 37, "section": "2.7.1 – Space Ahead", "stem": "At 55 mph, how many seconds of following distance should a 40-foot vehicle leave?", "choices": [ "5 seconds", "4 seconds", "6 seconds", "2 seconds" ], "answer": 0, "explanation": "Over 40 mph you add one second, so a 40-foot vehicle needs 5 seconds and a 60-foot rig needs 7 seconds.", "source": { "section": "2.7.1 – Space Ahead", "page": 35, "printedPage": "2-17", "fact": "follow-above-40" } }, { "id": "general-knowledge-038", "number": 38, "section": "2.7.2 – Space Behind", "stem": "What should you do if you find yourself being tailgated?", "choices": [ "Increase your following distance, avoid quick changes, and do not speed up", "Speed up to get away from the tailgater", "Flash your brake lights and slow suddenly", "Move to the left lane and brake hard" ], "answer": 0, "explanation": "To reduce the chance of a crash when tailgated, avoid quick changes, increase your following distance, do not speed up, and avoid tricks.", "source": { "section": "2.7.2 – Space Behind", "page": 35, "printedPage": "2-17" } }, { "id": "general-knowledge-039", "number": 39, "section": "2.7.4 – Space Overhead", "stem": "Why can an empty cargo van be more likely to hit an overhead object than a loaded one?", "choices": [ "An empty van is higher than a loaded one", "An empty van is wider than a loaded one", "An empty van has no brakes", "An empty van drifts sideways" ], "answer": 0, "explanation": "The weight of cargo changes a van's height; an empty van is higher than a loaded one, so getting under a bridge loaded does not mean you can do it empty.", "source": { "section": "2.7.4 – Space Overhead", "page": 36, "printedPage": "2-18" } }, { "id": "general-knowledge-040", "number": 40, "section": "2.7.5 – Space Below", "stem": "Which of these can cause the ends of a vehicle to drag or hang up?", "choices": [ "Drainage channels across roads and railroad tracks", "Rain on the windshield", "Strong side winds", "A loaded trailer" ], "answer": 0, "explanation": "Drainage channels across roads can cause the ends of some vehicles to drag, and railroad tracks can hang up vehicles with low underneath clearance.", "source": { "section": "2.7.5 – Space Below", "page": 36, "printedPage": "2-18" } }, { "id": "general-knowledge-041", "number": 41, "section": "2.7.6 – Space for Turns", "stem": "When making a right turn that requires swinging wide, when should you swing wide?", "choices": [ "As you complete the turn, keeping the rear close to the curb", "Before you start the turn, swinging left first", "In the middle of the intersection", "You should never swing wide" ], "answer": 0, "explanation": "If you cannot make the right turn without entering another lane, turn wide as you complete the turn and keep the rear of the vehicle close to the curb.", "source": { "section": "2.7.6 – Space for Turns", "page": 36, "printedPage": "2-18" } }, { "id": "general-knowledge-042", "number": 42, "section": "2.7.6 – Space for Turns", "stem": "When should you start a left turn in a large vehicle?", "choices": [ "After you have reached the center of the intersection", "As soon as the light turns green", "Before entering the intersection", "When oncoming traffic has stopped" ], "answer": 0, "explanation": "On a left turn, make sure you have reached the center of the intersection before you start the turn, or off-tracking may make the left side hit another vehicle.", "source": { "section": "2.7.6 – Space for Turns", "page": 36, "printedPage": "2-18" } }, { "id": "general-knowledge-043", "number": 43, "section": "2.7.6 – Space for Turns", "stem": "If there are two left-turn lanes, which one should a large vehicle use?", "choices": [ "The right turn lane, so the vehicle can be seen more readily", "The inside lane, so the turn is shorter", "Either lane, since they are equal", "The shoulder, outside both lanes" ], "answer": 0, "explanation": "If there are two turning lanes, always take the right turn lane, because drivers on your left can be more readily seen.", "source": { "section": "2.7.6 – Space for Turns", "page": 36, "printedPage": "2-18" } }, { "id": "general-knowledge-044", "number": 44, "section": "2.7.7 – Space Needed to Cross or Enter Traffic", "stem": "When crossing or entering traffic, why does a large vehicle need a bigger gap than a car?", "choices": [ "Because of slow acceleration and the space large vehicles require", "Because the driver sits higher", "Because large vehicles must drive in the left lane", "Because large vehicles have no reverse gear" ], "answer": 0, "explanation": "Slow acceleration and the space large vehicles require mean you may need a much larger gap to enter traffic than you would in a car.", "source": { "section": "2.7.7 – Space Needed to Cross or Enter Traffic", "page": 37, "printedPage": "2-19" } }, { "id": "general-knowledge-045", "number": 45, "section": "2.8.1 – Importance of Seeing Hazards", "stem": "What is a hazard, as the manual defines it?", "choices": [ "Any road condition or other road user that is a possible danger", "Only a vehicle that has already crashed", "Only a defect in your own vehicle", "Any intersection with a traffic light" ], "answer": 0, "explanation": "A hazard is any road condition or other road user, such as a driver, bicyclist, or pedestrian, that is a possible danger.", "source": { "section": "2.8.1 – Importance of Seeing Hazards", "page": 37, "printedPage": "2-19" } }, { "id": "general-knowledge-046", "number": 46, "section": "2.8.2 – Hazardous Roads", "stem": "What do move-over laws require you to do near a stopped emergency vehicle or work zone?", "choices": [ "Slow down and change lanes if it is safe", "Stop and wait for a police escort", "Speed up to clear the area quickly", "Sound your horn all the way past" ], "answer": 0, "explanation": "Move-over laws require drivers to slow and change lanes when approaching a roadside incident or emergency vehicle if safety and traffic conditions permit.", "source": { "section": "2.8.2 – Hazardous Roads", "page": 37, "printedPage": "2-19" } }, { "id": "general-knowledge-047", "number": 47, "section": "2.8.3 – Drivers Who Are Hazards", "stem": "Which of these is a clue that a driver may be impaired?", "choices": [ "Weaving across the road or drifting from one side to another", "Driving exactly at the speed limit", "Using turn signals before changing lanes", "Stopping behind the stop line" ], "answer": 0, "explanation": "Weaving, leaving the road, stopping at the wrong time, and speeding up or slowing down suddenly are clues that a driver may be impaired.", "source": { "section": "2.8.3 – Drivers Who Are Hazards", "page": 39, "printedPage": "2-21" } }, { "id": "general-knowledge-048", "number": 48, "section": "2.9.3 – Types of Distractions", "stem": "What is a mental distraction while driving?", "choices": [ "An activity that takes your mind away from the road", "An activity that takes your hands off the wheel", "A defect in the steering system", "A distraction outside the vehicle only" ], "answer": 0, "explanation": "A mental distraction takes your mind away from the road, such as a conversation with a passenger or thinking about something that happened during the day.", "source": { "section": "2.9.3 – Types of Distractions", "page": 40, "printedPage": "2-22" } }, { "id": "general-knowledge-049", "number": 49, "section": "2.9.4 – Cell/Mobile Phones", "stem": "Your CDL is disqualified for how long for a second conviction of using a hand-held mobile phone while operating a CMV within three years?", "choices": [ "60 days", "30 days", "120 days", "One year" ], "answer": 0, "explanation": "A second hand-held phone conviction within three years disqualifies your CDL for 60 days, and three or more offenses bring 120 days.", "source": { "section": "2.9.4 – Cell/Mobile Phones", "page": 40, "printedPage": "2-22", "fact": "phone-disqualification" } }, { "id": "general-knowledge-050", "number": 50, "section": "2.9.4 – Cell/Mobile Phones", "stem": "When may you use a hand-held mobile phone while operating a CMV?", "choices": [ "In an emergency, to communicate with law enforcement or emergency services", "Whenever traffic is light", "Only when stopped at a red light", "When the call is expected to be short" ], "answer": 0, "explanation": "The rule has an emergency exception that allows hand-held phone use to communicate with law enforcement officials or other emergency services.", "source": { "section": "2.9.4 – Cell/Mobile Phones", "page": 40, "printedPage": "2-22" } }, { "id": "general-knowledge-051", "number": 51, "section": "2.9.5 – Texting", "stem": "How much greater are the odds of a safety-critical event for a CMV driver who texts while driving?", "choices": [ "23.2 times greater", "6 times greater", "2 times greater", "39 percent greater" ], "answer": 0, "explanation": "The odds of a safety-critical event are 23.2 times greater for CMV drivers who engage in texting while driving.", "source": { "section": "2.9.5 – Texting", "page": 41, "printedPage": "2-23", "fact": "texting-odds" } }, { "id": "general-knowledge-052", "number": 52, "section": "2.10.1 – What Is It?", "stem": "What is the difference between aggressive driving and road rage?", "choices": [ "Aggressive driving is selfish and pushy, while road rage is operating with intent to harm others", "Aggressive driving is always legal, while road rage is a traffic ticket", "Aggressive driving happens only in cities, while road rage happens only on highways", "There is no difference" ], "answer": 0, "explanation": "Aggressive driving is operating in a selfish, bold, or pushy manner without regard for others, while road rage is operating with intent to harm or assault.", "source": { "section": "2.10.1 – What Is It?", "page": 42, "printedPage": "2-24" } }, { "id": "general-knowledge-053", "number": 53, "section": "2.10.3 – What You Should Do When Confronted", "stem": "What should you do when confronted by an aggressive driver?", "choices": [ "Make every attempt to get out of their way", "Speed up to stay ahead of them", "Avoid eye contact and hold your lane", "Follow them until they stop" ], "answer": 0, "explanation": "The first and most important step when confronted by an aggressive driver is to make every attempt to get out of their way.", "source": { "section": "2.10.3 – What You Should Do When Confronted", "page": 42, "printedPage": "2-24" } }, { "id": "general-knowledge-054", "number": 54, "section": "2.11.4 – Vehicle Factors", "stem": "About how far ahead can you see with low beams and with high beams at night?", "choices": [ "About 250 feet with low beams and 350 to 500 feet with high beams", "About 100 feet with low beams and 200 feet with high beams", "About 500 feet with low beams and 1,000 feet with high beams", "About 50 feet with low beams and 150 feet with high beams" ], "answer": 0, "explanation": "With low beams you can see ahead about 250 feet and with high beams about 350 to 500 feet, so you must adjust your speed to your sight distance.", "source": { "section": "2.11.4 – Vehicle Factors", "page": 45, "printedPage": "2-27", "fact": "night-beams" } }, { "id": "general-knowledge-055", "number": 55, "section": "2.11.5 – Night Driving Procedures", "stem": "How close must an oncoming vehicle or a vehicle you are following be before you dim your headlights?", "choices": [ "Within 500 feet", "Within 100 feet", "Within 1,000 feet", "Within 50 feet" ], "answer": 0, "explanation": "Dim your lights within 500 feet of an oncoming vehicle and when following another vehicle within 500 feet.", "source": { "section": "2.11.5 – Night Driving Procedures", "page": 45, "printedPage": "2-27", "fact": "dim-lights" } }, { "id": "general-knowledge-056", "number": 56, "section": "2.11.2 – Driver Factors", "stem": "How does getting 6 hours of sleep or less affect your crash risk?", "choices": [ "It triples your risk", "It has no effect", "It doubles your risk", "It only affects night driving" ], "answer": 0, "explanation": "The manual lists sleeping 6 hours or less as a fatigue risk that triples your risk of a crash.", "source": { "section": "2.11.2 – Driver Factors", "page": 44, "printedPage": "2-26", "fact": "fatigue-sleep" } }, { "id": "general-knowledge-057", "number": 57, "section": "2.12 – Driving in Fog", "stem": "What is the best advice for driving in fog?", "choices": [ "Do not drive; pull off the road into a rest area or truck stop", "Drive faster to get through it quickly", "Use high beams so you can see farther", "Follow the taillights ahead closely" ], "answer": 0, "explanation": "The best advice for driving in fog is do not; it is preferable to pull off the road into a rest area or truck stop until visibility is better.", "source": { "section": "2.12 – Driving in Fog", "page": 46, "printedPage": "2-28" } }, { "id": "general-knowledge-058", "number": 58, "section": "2.12 – Driving in Fog", "stem": "Which lights should you use if you must drive in fog?", "choices": [ "Low-beam headlights and fog lights, with four-way flashers on", "High-beam headlights only", "Parking lights only", "No lights, so you do not reflect glare" ], "answer": 0, "explanation": "In fog you should use low-beam headlights and fog lights for best visibility, turn on your four-way flashers, and avoid passing.", "source": { "section": "2.12 – Driving in Fog", "page": 46, "printedPage": "2-28" } }, { "id": "general-knowledge-059", "number": 59, "section": "2.13.2 – Driving", "stem": "What does a lack of spray from other vehicles tell you in winter?", "choices": [ "Ice has formed on the road", "The road is only wet", "The other drivers are speeding", "Your wipers are broken" ], "answer": 0, "explanation": "A lack of spray from other vehicles indicates that ice has formed on the road.", "source": { "section": "2.13.2 – Driving", "page": 47, "printedPage": "2-29" } }, { "id": "general-knowledge-060", "number": 60, "section": "2.13.2 – Driving", "stem": "What should you do if your brakes get wet after driving through deep water?", "choices": [ "Slow down, use a low gear, and apply light pressure to heat and dry them", "Stop immediately and let them air dry", "Apply the parking brake until they dry", "Speed up to blow the water off" ], "answer": 0, "explanation": "After crossing water, slow down, place the transmission in a low gear, maintain light pressure on the brakes to heat and dry them, then make a test stop.", "source": { "section": "2.13.2 – Driving", "page": 47, "printedPage": "2-29" } }, { "id": "general-knowledge-061", "number": 61, "section": "2.14.1 – Vehicle Checks", "stem": "How often should you inspect your tires when driving in very hot weather?", "choices": [ "Every 2 hours or every 100 miles", "Once a day", "Every 8 hours or every 500 miles", "Only before the trip" ], "answer": 0, "explanation": "Check the tire mounting and air pressure, and inspect the tires every 2 hours or every 100 miles when driving in very hot weather.", "source": { "section": "2.14.1 – Vehicle Checks", "page": 47, "printedPage": "2-29", "fact": "hot-tires-check" } }, { "id": "general-knowledge-062", "number": 62, "section": "2.14.1 – Vehicle Checks", "stem": "What should you do if a tire is too hot to touch in very hot weather?", "choices": [ "Remain stopped until the tire cools off", "Let air out to reduce the pressure", "Pour water on the tire to cool it", "Keep driving at a slow speed" ], "answer": 0, "explanation": "If a tire is too hot to touch, remain stopped until the tire cools off, or it may blow out or catch fire, and do not let air out of hot tires.", "source": { "section": "2.14.1 – Vehicle Checks", "page": 48, "printedPage": "2-30", "fact": "hot-tire-cool" } }, { "id": "general-knowledge-063", "number": 63, "section": "2.15.2 – Warning Signs and Devices", "stem": "Which vehicles are required to stop at railroad-highway crossings?", "choices": [ "Passenger and hazardous materials carrying vehicles", "Only school buses", "Only vehicles pulling trailers", "All commercial vehicles" ], "answer": 0, "explanation": "The manual states that all passenger and hazmat carrying vehicles are required to stop at railroad-highway crossings.", "source": { "section": "2.15.2 – Warning Signs and Devices", "page": 49, "printedPage": "2-31" } }, { "id": "general-knowledge-064", "number": 64, "section": "2.15.2 – Warning Signs and Devices", "stem": "If there is no white stop line painted on the pavement, how close may a vehicle required to stop get to the nearest rail?", "choices": [ "No closer than 15 feet or more than 50 feet", "No closer than 5 feet or more than 25 feet", "Exactly 10 feet", "No closer than 100 feet" ], "answer": 0, "explanation": "Vehicles required to stop must stop no closer than 15 feet or more than 50 feet from the nearest rail of the nearest track.", "source": { "section": "2.15.2 – Warning Signs and Devices", "page": 49, "printedPage": "2-31", "fact": "rr-stop-distance" } }, { "id": "general-knowledge-065", "number": 65, "section": "2.15.2 – Warning Signs and Devices", "stem": "What must you do when a railroad crossing's lights begin to flash?", "choices": [ "Stop, because a train is approaching", "Speed up to cross before the train arrives", "Proceed if you do not see a train", "Sound your horn and continue" ], "answer": 0, "explanation": "When the flashing red lights begin, stop; a train is approaching and you must yield the right-of-way.", "source": { "section": "2.15.2 – Warning Signs and Devices", "page": 49, "printedPage": "2-31" } }, { "id": "general-knowledge-066", "number": 66, "section": "2.15.3 – Driving Procedures", "stem": "Why must you double check before crossing double railroad tracks?", "choices": [ "A train on one track may hide a train on the other track", "The gates only cover one track", "Only one track is active at a time", "The signals are often broken" ], "answer": 0, "explanation": "A train on one track may hide a train on the other, so look both ways and be sure no other trains are near before starting across.", "source": { "section": "2.15.3 – Driving Procedures", "page": 50, "printedPage": "2-32" } }, { "id": "general-knowledge-067", "number": 67, "section": "2.15.5 – Crossing the Tracks", "stem": "How long does it take a typical tractor-trailer to clear a single track and a double track?", "choices": [ "At least 14 seconds for a single track and more than 15 seconds for a double track", "At least 5 seconds for a single track and 10 seconds for a double track", "At least 30 seconds for a single track and 60 seconds for a double track", "It depends only on the driver" ], "answer": 0, "explanation": "It takes a typical tractor-trailer at least 14 seconds to clear a single track and more than 15 seconds to clear a double track.", "source": { "section": "2.15.5 – Crossing the Tracks", "page": 50, "printedPage": "2-32", "fact": "rr-clear-time" } }, { "id": "general-knowledge-068", "number": 68, "section": "2.16.1 – Select a Safe Speed", "stem": "Which of these determines your safe speed on a long, steep downgrade?", "choices": [ "Total weight of the vehicle and cargo, the grade, road conditions, and weather", "The price of diesel and the size of the fuel tanks", "The color of the cab and the number of mirrors", "The age of the tires only" ], "answer": 0, "explanation": "Select a speed that is not too fast for the total weight, length and steepness of the grade, road conditions, and weather.", "source": { "section": "2.16.1 – Select a Safe Speed", "page": 50, "printedPage": "2-32" } }, { "id": "general-knowledge-069", "number": 69, "section": "2.16.2 – Select the Right Gear before Starting Down the Grade", "stem": "Why should you not try to downshift after your speed has built up on a downgrade?", "choices": [ "You may not be able to get back into gear and all engine braking will be lost", "The transmission will shift too early", "It uses too much fuel", "The brakes will overheat the clutch" ], "answer": 0, "explanation": "If you try to downshift after your speed has built up, you may not be able to shift into a lower gear or get back into any gear, and all engine braking effect will be lost.", "source": { "section": "2.16.2 – Select the Right Gear before Starting Down the Grade", "page": 51, "printedPage": "2-33" } }, { "id": "general-knowledge-070", "number": 70, "section": "2.16.3 – Brake Fading or Failure", "stem": "What causes brake fade?", "choices": [ "Excessive heat from using the brakes too much instead of engine braking", "Cold weather only", "Using the engine brake too much", "Too much brake adjustment" ], "answer": 0, "explanation": "Brakes can fade or fail from excessive heat caused by using them too much and not relying on the engine braking effect, and adjustment also affects fade.", "source": { "section": "2.16.3 – Brake Fading or Failure", "page": 51, "printedPage": "2-33" } }, { "id": "general-knowledge-071", "number": 71, "section": "2.16.4 – Proper Braking Technique", "stem": "On a long downgrade, when should you release the brakes after applying them?", "choices": [ "When your speed has been reduced to about five mph below your safe speed", "When your speed reaches the posted speed limit", "After exactly 10 seconds", "Only when you reach the bottom of the grade" ], "answer": 0, "explanation": "Apply the brakes just hard enough to feel a definite slowdown, release when you are about five mph below your safe speed, and repeat when speed returns.", "source": { "section": "2.16.4 – Proper Braking Technique", "page": 51, "printedPage": "2-33", "fact": "downgrade-braking" } }, { "id": "general-knowledge-072", "number": 72, "section": "2.16.4 – Proper Braking Technique", "stem": "What are escape ramps designed to do?", "choices": [ "Stop runaway vehicles safely using a long bed of loose, soft material", "Provide a place to park overnight", "Let drivers turn around on the mountain", "Cool hot brakes with water" ], "answer": 0, "explanation": "Escape ramps are made to stop runaway vehicles safely using a long bed of loose, soft material, sometimes combined with an upgrade.", "source": { "section": "2.16.4 – Proper Braking Technique", "page": 51, "printedPage": "2-33" } }, { "id": "general-knowledge-073", "number": 73, "section": "2.17.1 – Steering to Avoid a Crash", "stem": "Why should you keep both hands on the steering wheel at all times?", "choices": [ "So you can turn quickly in an emergency", "So the horn is easier to reach", "So your arms do not get tired", "So you can shift gears without the clutch" ], "answer": 0, "explanation": "To turn quickly in an emergency you must have a firm grip on the steering wheel with both hands, and the best way is to keep them there all the time.", "source": { "section": "2.17.1 – Steering to Avoid a Crash", "page": 52, "printedPage": "2-34" } }, { "id": "general-knowledge-074", "number": 74, "section": "2.17.1 – Steering to Avoid a Crash", "stem": "If an oncoming driver has drifted into your lane, which way should you steer?", "choices": [ "To the right", "To the left", "Straight ahead", "Whichever side has oncoming traffic" ], "answer": 0, "explanation": "If an oncoming driver has drifted into your lane, a move to your right is best, because that driver will naturally return to his or her own lane.", "source": { "section": "2.17.1 – Steering to Avoid a Crash", "page": 52, "printedPage": "2-34" } }, { "id": "general-knowledge-075", "number": 75, "section": "2.17.1 – Steering to Avoid a Crash", "stem": "If you have to leave the road in an emergency, what should you do about braking?", "choices": [ "Avoid using the brakes until your speed drops to about 20 mph", "Brake as hard as possible while on the shoulder", "Apply the parking brake immediately", "Hold the brake and steer sharply back onto the road" ], "answer": 0, "explanation": "If you leave the road, avoid braking until your speed has dropped to about 20 mph, then brake gently to avoid skidding on a loose surface.", "source": { "section": "2.17.1 – Steering to Avoid a Crash", "page": 52, "printedPage": "2-34" } }, { "id": "general-knowledge-076", "number": 76, "section": "2.17.2 – How to Stop Quickly and Safely", "stem": "What is controlled braking?", "choices": [ "Applying the brakes as hard as you can without locking the wheels", "Pushing the brake pedal to the floor and holding it", "Pumping the brakes rapidly by hand", "Using the trailer hand valve alone" ], "answer": 0, "explanation": "With controlled braking you apply the brakes as hard as you can without locking the wheels, keeping steering wheel movements very small.", "source": { "section": "2.17.2 – How to Stop Quickly and Safely", "page": 52, "printedPage": "2-34" } }, { "id": "general-knowledge-077", "number": 77, "section": "2.17.2 – How to Stop Quickly and Safely", "stem": "What is stab braking?", "choices": [ "Applying the brakes fully, releasing when the wheels lock, and reapplying when they roll", "Tapping the brake pedal lightly many times", "Holding the brakes just below the lock-up point", "Braking only with the trailer hand valve" ], "answer": 0, "explanation": "With stab braking you apply the brakes all the way, release when the wheels lock up, and apply fully again as soon as the wheels start rolling.", "source": { "section": "2.17.2 – How to Stop Quickly and Safely", "page": 53, "printedPage": "2-35" } }, { "id": "general-knowledge-078", "number": 78, "section": "2.17.3 – Brake Failure", "stem": "If hydraulic brakes fail because of a loss of pressure, what should you do?", "choices": [ "Downshift, pump the brakes, use the parking brake, and find an escape route", "Hold the brake pedal to the floor and wait", "Accelerate to build pressure", "Turn off the engine immediately" ], "answer": 0, "explanation": "When hydraulic pressure is lost, downshift, pump the brake pedal to try to build pressure, use the parking brake carefully, and find an escape route.", "source": { "section": "2.17.3 – Brake Failure", "page": 53, "printedPage": "2-35" } }, { "id": "general-knowledge-079", "number": 79, "section": "2.17.4 – Tire Failure", "stem": "What should you do immediately if a tire fails while you are driving?", "choices": [ "Hold the steering wheel firmly and stay off the brake until the vehicle slows", "Brake hard to stop quickly", "Pull the parking brake to lock the wheels", "Speed up to stabilize the vehicle" ], "answer": 0, "explanation": "When a tire fails, hold the steering wheel firmly and stay off the brake; braking could cause loss of control until the vehicle has slowed down.", "source": { "section": "2.17.4 – Tire Failure", "page": 53, "printedPage": "2-35" } }, { "id": "general-knowledge-080", "number": 80, "section": "2.18.1 – How Antilock Braking Systems Work", "stem": "How does ABS help you?", "choices": [ "It keeps the wheels from locking up during hard braking", "It always shortens stopping distance", "It lets you drive faster safely", "It replaces the normal brakes" ], "answer": 0, "explanation": "ABS keeps your wheels from locking up during hard brake applications and helps you keep the vehicle under control, though it does not necessarily shorten stopping distance.", "source": { "section": "2.18.1 – How Antilock Braking Systems Work", "page": 54, "printedPage": "2-36" } }, { "id": "general-knowledge-081", "number": 81, "section": "2.18.2 – Vehicles Required to Have Antilock Braking Systems", "stem": "Which trucks are required by the Department of Transportation to have ABS?", "choices": [ "Truck tractors with air brakes built on or after March 1, 1997", "All trucks built after 1980", "Only vehicles with hydraulic brakes", "Only buses and school buses" ], "answer": 0, "explanation": "ABS is required on truck tractors with air brakes built on or after March 1, 1997, and other air brake vehicles built on or after March 1, 1998.", "source": { "section": "2.18.2 – Vehicles Required to Have Antilock Braking Systems", "page": 54, "printedPage": "2-36", "fact": "abs-required-dates" } }, { "id": "general-knowledge-082", "number": 82, "section": "2.18.3 – How to Know If Your Vehicle Is Equipped with ABS", "stem": "Where are the yellow ABS malfunction lamps on a trailer?", "choices": [ "On the left side, either the front or rear corner", "On the instrument panel only", "On the right side near the taillight", "On the rear doors" ], "answer": 0, "explanation": "Trailers have yellow ABS malfunction lamps on the left side, either on the front or rear corner, while tractors, trucks, and buses have them on the instrument panel.", "source": { "section": "2.18.3 – How to Know If Your Vehicle Is Equipped with ABS", "page": 54, "printedPage": "2-36" } }, { "id": "general-knowledge-083", "number": 83, "section": "2.18.6 – Braking with ABS", "stem": "When can you fully apply the brakes in an emergency if you have ABS?", "choices": [ "When you have working ABS on all axles", "Never, the brakes will lock", "Only when the trailer has no ABS", "Only on dry pavement" ], "answer": 0, "explanation": "The one exception to braking normally with ABS is that if you have working ABS on all axles, in an emergency stop you can fully apply the brakes.", "source": { "section": "2.18.6 – Braking with ABS", "page": 55, "printedPage": "2-37" } }, { "id": "general-knowledge-084", "number": 84, "section": "2.19 – Skid Control and Recovery", "stem": "Which of these causes a skid?", "choices": [ "Over-braking, over-steering, over-acceleration, or driving too fast", "Under-inflating the trailer tires only", "Using the engine brake on a downgrade", "Driving with the windows open" ], "answer": 0, "explanation": "A skid happens when tires lose their grip from over-braking, over-steering, over-acceleration, or driving too fast for conditions.", "source": { "section": "2.19 – Skid Control and Recovery", "page": 55, "printedPage": "2-37" } }, { "id": "general-knowledge-085", "number": 85, "section": "2.19.2 – Correcting a Drive-wheel Braking Skid", "stem": "How do you correct a drive-wheel braking skid?", "choices": [ "Stop braking and counter-steer", "Brake harder and turn into the skid", "Apply the trailer hand brake", "Accelerate until the wheels grip" ], "answer": 0, "explanation": "To correct a drive-wheel braking skid, stop braking so the rear wheels roll again, counter-steer, and push in the clutch on a very slippery surface.", "source": { "section": "2.19.2 – Correcting a Drive-wheel Braking Skid", "page": 55, "printedPage": "2-37" } }, { "id": "general-knowledge-086", "number": 86, "section": "2.19.3 – Front-wheel Skids", "stem": "What is the only way to stop a front-wheel skid?", "choices": [ "Let the vehicle slow down by stopping turning and braking so hard", "Turn the wheel harder into the turn", "Apply more braking power", "Pull the parking brake" ], "answer": 0, "explanation": "In a front-wheel skid the front end goes straight no matter how much you turn, so the only way to stop the skid is to let the vehicle slow down.", "source": { "section": "2.19.3 – Front-wheel Skids", "page": 56, "printedPage": "2-38" } }, { "id": "general-knowledge-087", "number": 87, "section": "2.20.1 – Protect the Area", "stem": "What is the first thing to do at an accident scene?", "choices": [ "Keep another accident from happening in the same spot", "Move all the vehicles off the road", "Take photographs for insurance", "Call your dispatcher" ], "answer": 0, "explanation": "The first thing to do at an accident scene is to protect the area so another accident does not happen in the same spot.", "source": { "section": "2.20.1 – Protect the Area", "page": 56, "printedPage": "2-38" } }, { "id": "general-knowledge-088", "number": 88, "section": "2.20.3 – Care for the Injured", "stem": "When should you move a severely injured person?", "choices": [ "Only when the danger of fire or passing traffic makes it necessary", "As soon as possible, to make them comfortable", "Whenever help is more than five minutes away", "Never, under any circumstances" ], "answer": 0, "explanation": "Do not move a severely injured person unless the danger of fire or passing traffic makes it necessary.", "source": { "section": "2.20.3 – Care for the Injured", "page": 56, "printedPage": "2-38" } }, { "id": "general-knowledge-089", "number": 89, "section": "2.20.3 – Care for the Injured", "stem": "How should you stop heavy bleeding at an accident scene?", "choices": [ "Apply direct pressure to the wound", "Give the person water to drink", "Elevate the person's head", "Wait for emergency services without touching the wound" ], "answer": 0, "explanation": "The manual says to stop heavy bleeding by applying direct pressure to the wound.", "source": { "section": "2.20.3 – Care for the Injured", "page": 57, "printedPage": "2-39" } }, { "id": "general-knowledge-090", "number": 90, "section": "2.21.3 – Fire Fighting", "stem": "What should you do about the hood if the engine is on fire?", "choices": [ "Do not open the hood if you can avoid it; shoot foam through louvers or the radiator", "Open the hood fully to spray inside", "Open the hood a little to let smoke out", "Pour water through the grille" ], "answer": 0, "explanation": "With an engine fire, turn off the engine as soon as you can and do not open the hood if you can avoid it; shoot foam through louvers, the radiator, or the underside.", "source": { "section": "2.21.3 – Fire Fighting", "page": 57, "printedPage": "2-39" } }, { "id": "general-knowledge-091", "number": 91, "section": "2.21.3 – Fire Fighting", "stem": "What should you do with the doors of a van or box trailer that is on fire?", "choices": [ "Keep the doors shut, especially if the cargo contains hazardous materials", "Open the doors to let the smoke out", "Open the doors so firefighters can see", "Knock down the doors with a tool" ], "answer": 0, "explanation": "For a cargo fire in a van or box trailer, keep the doors shut because opening them supplies the fire with oxygen and can make it burn very fast.", "source": { "section": "2.21.3 – Fire Fighting", "page": 57, "printedPage": "2-39" } }, { "id": "general-knowledge-092", "number": 92, "section": "2.21.2 – Fire Prevention", "stem": "Which fire extinguisher is designed for electrical fires and burning liquids?", "choices": [ "B:C type", "A:B:C type", "Water only", "A type" ], "answer": 0, "explanation": "The B:C type extinguisher is designed for electrical fires and burning liquids, while A:B:C also works on wood, paper, and cloth.", "source": { "section": "2.21.2 – Fire Prevention", "page": 57, "printedPage": "2-39" } }, { "id": "general-knowledge-093", "number": 93, "section": "2.22.1 – Alcohol and Driving", "stem": "How fast can the liver process alcohol?", "choices": [ "About one-third of an ounce per hour, roughly one drink per hour", "About three drinks per hour", "About one ounce per minute", "The liver does not process alcohol" ], "answer": 0, "explanation": "The liver can only process about one-third of an ounce of alcohol per hour, which is less than a standard drink, and this rate is fixed.", "source": { "section": "2.22.1 – Alcohol and Driving", "page": 58, "printedPage": "2-40", "fact": "liver-rate" } }, { "id": "general-knowledge-094", "number": 94, "section": "2.22.1 – Alcohol and Driving", "stem": "Which factors determine your blood alcohol concentration?", "choices": [ "The amount of alcohol you drink, how fast you drink it, and your weight", "Only your weight and height", "The type of food you ate that day", "The size of the vehicle you drive" ], "answer": 0, "explanation": "BAC is determined by the amount of alcohol you drink, how fast you drink, and your weight.", "source": { "section": "2.22.1 – Alcohol and Driving", "page": 58, "printedPage": "2-40" } }, { "id": "general-knowledge-095", "number": 95, "section": "2.22.1 – Alcohol and Driving", "stem": "Which part of the brain does alcohol affect first?", "choices": [ "The part that controls judgment and self-control", "The part that controls breathing", "The part that controls the heart rate", "The part that controls balance only" ], "answer": 0, "explanation": "Alcohol first affects the part of the brain that controls judgment and self-control, which keeps drinkers from knowing they are getting drunk.", "source": { "section": "2.22.1 – Alcohol and Driving", "page": 59, "printedPage": "2-41" } }, { "id": "general-knowledge-096", "number": 96, "section": "2.22.1 – Alcohol and Driving", "stem": "According to the manual's effects table, at what blood alcohol content is a person typically unable to drive?", "choices": [ "0.15", "0.05", "0.08", "0.10" ], "answer": 0, "explanation": "The table lists .15 as the level where a person has impaired balance and movement and is unable to drive, while .08 is the drunk driving limit.", "source": { "section": "2.22.1 – Alcohol and Driving", "page": 60, "printedPage": "2-42" } }, { "id": "general-knowledge-097", "number": 97, "section": "2.23.2 – Why Are There Rules?", "stem": "What is the intent of the hazardous materials rules?", "choices": [ "To contain the product, communicate the risk, and ensure safe drivers and equipment", "To raise shipping prices and reduce competition", "To keep hazmat off public roads entirely", "To protect only the shipper's cargo" ], "answer": 0, "explanation": "The rules intend to contain the product, communicate the risk, and ensure safe drivers and equipment.", "source": { "section": "2.23.2 – Why Are There Rules?", "page": 60, "printedPage": "2-42" } }, { "id": "general-knowledge-098", "number": 98, "section": "2.23.3 – Lists of Regulated Products", "stem": "How many identical placards must a placarded vehicle have at a minimum?", "choices": [ "At least four, on the front, rear, and both sides", "At least one, on the rear", "At least two, on both sides", "At least six, on every corner" ], "answer": 0, "explanation": "A placarded vehicle must have at least four identical placards, put on the front, rear, and both sides, readable from all four directions.", "source": { "section": "2.23.3 – Lists of Regulated Products", "page": 61, "printedPage": "2-43", "fact": "hazmat-placards" } }, { "id": "general-knowledge-099", "number": 99, "section": "2.23.3 – Lists of Regulated Products", "stem": "Where should a driver keep shipping papers for hazardous materials?", "choices": [ "On top of other shipping papers, in a pouch on the driver's door or within reach", "Locked in the trailer with the cargo", "Mailed to the receiver in advance", "Under the driver's seat with the tools" ], "answer": 0, "explanation": "Keep hazardous materials shipping papers on top of other shipping papers and in a pouch on the driver's door, in clear view within reach, or on the driver's seat when out.", "source": { "section": "2.23.3 – Lists of Regulated Products", "page": 61, "printedPage": "2-43" } }, { "id": "general-knowledge-100", "number": 100, "section": "2.23.3 – Lists of Regulated Products", "stem": "When must your license have a hazardous materials endorsement?", "choices": [ "When the vehicle requires placards", "Only when hauling explosives", "Only when crossing state lines", "Whenever the load weighs over 10,000 pounds" ], "answer": 0, "explanation": "You can drive a vehicle carrying hazardous materials if it does not require placards, but if it does require placards you must have the hazardous materials endorsement.", "source": { "section": "2.23.3 – Lists of Regulated Products", "page": 61, "printedPage": "2-43" } } ] }