CA DMV CDL General Questions New

Which of these statements is true about speed management:

A) Shady parts of the road allow better traction than open area.
B) Road surfaces will freeze before bridges
C) On slippery roads, it takes longer to stop and is harder to turn without skidding.

Which of these is a good thing to do when you steer to avoid a crash:

A) Apply the brakes while turning.
B) Don't turn the steering wheel any more than needed.
C) Avoid counter steering.

When driving through a highway work zone, you should:

A) Decrease your speed even further when a worker is close to the roadway.
B) Adjust your speed to the speed of the other vehicles.
C) Increase your speed if no construction is observable

The purpose of retarders is to:

A) Apply extra braking power to the non-drive axles.
B) Help slow the vehicle while driving and reduce brake wear.
C) Help prevent skids and reduce brake wear.

If you had a heavy load that is slowing you down on a turn you should:

A) Exit the road until traffic is lighter.
B) Shift into a lower gear.
C) Drive on the shoulder so others can pass easily.

Aggressive driving is:

A) Driving a vehicle with the intent to do harm to others.
B) Driving a vehicle when your full attention is not on driving.
C) Driving a vehicle in a selfish, bold, or pushy manner.

Most serious skids result from:

A) Will not happen with radial tires.
B) Driving too fast for conditions.
C) Turning too sharply on ice.

Containerized loads:

A) Are generally used for freight carried part way by rail or ship.
B) Should come with their own tie-down devices or locks.
C) Do not need to be inspected or secured by driver.

When you are passing another vehicle, pedestrian, or bicyclist, you should know that they:

A) Know you want to pass
B) See your vehicle.
C) May move into traffic.

What should you do before driving in the mountain:

A) Know the escape ramp location on your route.
B) Unhook your steering axle brake.
C) Carry tire chains in your vehicle.

The Commercial Driver Handbook suggests several things to do when you pass a vehicle. Which of these is not one of them?

A) At night, turn on your high beams while you pass the vehicle.
B) Lightly tap your horn, if needed.
C) Assume the other vehicle does not see you.

What should you do if a car coming toward you at night keeps its high beams on?

A) Look to the right edge of your lane or right side of the road.
B) Slow down and look straight ahead in your lane.
C) Flash your high beams at the other vehicle.

Retarders:

A) Allow you to disconnect the steering axle brakes.
B) Cannot be used on interstate highways.
C) Can cause the driver's wheels to skid when they have poor traction.

If you are ______ slower because of a distraction, the chance of a crash can double.

A) a quarter-second
B) one second
C) a half-second

Optional safety equipment may include emergency phone numbers, tire, chains, and:

A) Fully charged fire extinguisher.
B) Red reflective triangles.
C) Tire changing equipment

Can State Inspectors inspect your truck?

A) Yes, and they can put the vehicle out of service if it is unsafe.
B) No
C) Yes, but they cannot put the vehicle out of service.

Placards must be:

A) Placed on all four sides of vehicle.
B) Display on all vehicles transporting any amount of hazardous materials.
C) Places only on the front and rear of a vehicle.

When driving on a snow-packed road, you should reduce your speed by at least:

A) 1/4
B) 1/3
C) 1/2

Drivers of trucks and truck tractors with cargo must check that the cargo is well-secured within the first ______ miles of the trip.

A) 25
B) 10
C) 50

Which of the following is a good way to react to an aggressive driver?

A) Smoke a cigarette to relax.
B) Give the driver the benefit of the doubt.
C) Change the CD or have a snack.

Which of these statements is not true about engine belts in hot weather?

A) Cracking is likely to occur but is not a safety threat.
B) Loose belts will not turn the water pump and/or fan on properly.
C) You can check the tightness of the belts by pressing on them.

When braking for an emergency stop, with a vehicle that has anti-lock brakes on all axles, you should:

A) Pump the brakes until ABS takes over.
B) Apply full brakes.
C)Brake with enough force to maintain control.

Which of these statements is true about backing a heavy vehicle?

A) It's safer to back towards the right side of the vehicle.
B) You should avoid backing whenever you can.
C) Helpers should be out of sight and use only voice(spoken) signals to communicate with the driver.

The average driver needs ____ hours of sleep every 24 hours.

A) 7-8
B) 3-4
C) 5-6

Which of these actions is not recommended for a left turn?

A) Start in the inside lane and swing right as you turn.
B) Use the right-hand turn lane if there are two turning lanes.
C) Start your turn from the center of the intersection.

When driving at night, you should:

A) Adjust your speed to keep your stopping distance within your sight distance.
B) Look to the left side of the road when a vehicle is coming towards you.
C) Dim your lights within 300ft of an oncoming vehicle.

When driving on grades, which of these is the best choice for a safe speed?

A) Based on your vehicle and its cargo select a speed that is safe, within the posted speed.
B) Follow the vehicle in front of you.
C) If you have a right road, you can go faster then.

You are required to stop at a railroad grade crossing when:

A) The vehicle makes a stop mandatory under state or federal regulations.
B) There are flagmen, warning signals, or gates at the crossing.
C) The crossing is located in a city or town with frequent train traffic.

Which of these statements is true about drugs?

A) A driver can use any prescription drug while driving.
B) Certain prescription drugs are allowed to reduce fatigue.
C) Use of drugs can lead to collisions and/or arrest.

What should you do when your vehicle hydroplanes?

A) Accelerate slightly.
B) Release the accelerator.
C) Start stab braking.

It takes a typical tractor trailer at least ____ seconds to clear a single track railroad-highway grade crossing.

A) 18
B) 14
C) 10

You may get hung up on railroad tracks when:

A) You try to shift gears when crossing.
B) The tracks have a steep approach.
C) The posted speed is too slow.

You are checking your steering and exhaust system in pre-trucking inspection. Which of these problems should be fixed before the vehicle is driven?

A) Steering wheel play, no-more than 10%/2-inches on a 20in steering wheel.
B) Grey smoke from the exhaust pipe.
C) Oil on the tie rod.

Which of these statements explains the proper way to signal for a lane change?

A) Signal before you change lanes, then move over quickly.
B) Signal just as you being to change lanes, and drift over slowly. 
C) Signal early, and change lanes slowly and smoothly.

Truck escape ramps:

A) Help avoid damage to vehicles.
B) Are not for buses.
C) Cannot be used by certain types of heavy vehicles.

When starting to move up hill from a stop:

A) Release the parking brake as you apply engine power.
B) Keep the trailer brake valve applied until you reach 20mph.
C) Engage the clutch and accelerate quickly.

What should you do when you see a hazard in the roadway?

A) Use your 4-way flashes or brake lights to warn others.
B) Swerve around it and get back in your lane.
C) Come to a complete stop until hazard is clear.

Which of these statements is true about acceleration?

A) Rough acceleration can cause mechanical damage.
B) You should feel a "jerking" motion if you are accelerating your vehicle properly.
C) Using the trailer brake when starting is dangerous.

The vehicle you are driving has anti-lock brakes if:

A) When you turn on the ignition, a yellow ABS malfunction lamp lights up on the instrument panel.
B) The certification is on the driver-side door.
C) Read indicator lamps are on the brake cylinder.

If you cannot see well with your headlights, when driving in an area with few streetlights on a clear night, you should:

A) Use your high beams when legal and keep your interior lights off.
B) Turn your interior lights on.
C) Find another route that is better lit.

The space that is most important to manage around your vehicle is the:

A) Back
B) Front
C) Sides

Which of these statements is true about warning other drivers of a stopped vehicle?

A) Put out your emergency warning devices within 5 minutes.
B) Keep the vehicle's taillights on, to warn other drivers.
C) Move the rear reflective triangles back if the driver's vision is obscured within 500ft.

What happens to tar in road pavement during hot weather?

A) Nothing, it is made for hot weather.
B) It bleeds, making the road surface slippery.
C) It becomes gummy, making tires stick to the road.

Having anti-lock brakes, on only the tractor will:

A) Increase the likelihood of rear wheel skid when braking.
B) Decrease the likelihood of rear wheel skid when braking.
C) Anti-lock brakes should always be on.

If you must cross into the oncoming lane as  you make a turn, you should:

A) Complete your turn without stopping.
B) Back up to allow oncoming traffic to pass.
C) Watch for oncoming traffic.

If you are not sure how to put out a hazardous material fire, you should:

A) Wait for qualified firefighters.
B) Use dirt.
C) Use water.

Which of these is the proper use of a steering wheel?

A) Once you reach cruising speed, you can drive with only one hand on the wheel.
B) Only use both hands on the steering wheel when attempting a difficult turn.
C) Use both hands on the steering wheel to prevent it from pulling away.

Which of the following is true about anti-lock braking systems?

A) ABS changes the way you brake in an emergency.
B) ABS allows you to drive faster, follow more closely, or drive less carefully.
C) ABS prevents power turning skids.

Repeat of question 23.

You are driving a long vehicle that makes wide turns. You want to turn left from Pine St. into Cedar St. Both are two-lane, two-way streets. You should?

A) Begin turning your vehicle when halfway through the intersection.
B) Begin turning your vehicle as soon as you enter the intersection.
C) Turn into the left lane of Cedar St. and move to the right lane when the traffic is clear.

You are checking your wheels and rims during a pre-trip inspection. Which of these statements is true?

A) Mismatched lock rings can be used on the same vehicle.
B) A vehicle can be safely driven with one missing lug nut on the wheel.
C) Rust around the wheel nut may mean they are loose.

If you do not have a CB radio, what is the first thing you should do at a collision scene?

A) Care for the injured.
B) Protect the area.
C) Notify the authorities.

The distance that you should look ahead of your vehicle while driving is ____ at low speeds.

A) 2 blocks
B) 1/2 block
C) 1 block

Repeat of question 38

You are driving a heavy vehicle. You must exit a highway using an off ramp that curves downhill. You should?

A) Slow down to a safe speed before the curve.
B) Wait until you are in the curve before the downshifting.
C) Slow to the posted speed limit for the off ramp.

Repeat of question 39

If you have been drinking alcohol, before you drive you should:

A) Take a cold shower.
B) Drink coffee
C) Wait for it to wear off

Which of these is important to remember about emergency braking?

A) Never do it without downshifting first.
B) If the wheels are skidding, you cannot control the vehicle.
C) Disconnecting the steering axle brakes will help keep your vehicle in a straight line.

You will be placed out-of-service for 24 hours if your Blood Alcohol Concentration(BAC) is:

A) any detectable amount below .04%
B) at least .04%
C) at least .02%

When looking ahead of your vehicle, you should look:

A) To the right side of the road.
B) Straight ahead at all time.
C) Back and forth, near and far.

Trucks and buses are subject to certain laws, regulations, and restrictions. Which of these statements is true?

A) Laws and restrictions can vary from place to place.
B) Federal regulations apply only to trucks and buses driven at least 50 miles on a trip.
C) County and city laws do not apply to trucks and buses engaged in interstate commerce.

Which of these statements is true about mirror adjustment?

A) You should adjust your mirrors before you start a trip.
B) The mirrors can be adjusted correctly even if the trailer is not straight.
C) You can adjust the mirrors while you are driving.

Which of these statements is true about shipping hazardous materials?

A) A four-inch, diamond shaped, hazardous materials label must be on the container.
B) A four-inch, circular, red hazardous material label must be on the container.
C) Gas cylinder that will not hold a label must be shipped under cover.

When driving at night, you should:

A) Look to the left side of the road when a vehicle is coming towards you.
B) Adjust your speed to keep your stopping distance within your sight distance.
C) Dim your lights within 300ft of an oncoming vehicle.

You need at least ___ inch tread depth in every major groove of your front tires.

A) 4/32
B) 6/32
C) 2/32

When confronted by an aggressive driver, the very first thing you should do is:

A) Maintain your position.
B) Make every attempt to get out of their way.
C) Gesture that you made a mistake.

In rear tire failure, dual rear tires will:

A) Allow you to brake immediately.
B) Prevent vibration or thumping.
C) Usually prevent fishtail.

Which of these is not a danger when an automatic transmission is forced into a lower gear at high speed?

A) Loss of engine braking effect.
B) Loss of steering control.
C) Damage to the transmission.

A key principle to remember about loading cargo is to keep the load:

A) To the front.
B) Balanced in the cargo area.
C) To the rear.

Which of these statements is true about cargo types?

A) Tank vehicles used to transport liquids should always be fully loaded.
B) Oversize loads can be transported without a special permit when roads are not busy.
C) Unstable loads (e.g., hanging meat, livestock) require extra caution on curves.

Repeat of question 7.

Repeat of question 20.

Repeat of question 16.

Stab braking should not be used on a vehicle with:

A) Anti-lock brakes
B) Trailers
C) Hazardous materials.

Which of these is not something you should do if your headlights are not working?

A) Adjust the headlights.
B) Leave your high beams on.
C) Clean the headlights.

If you are forced to return to the road before you can stop on the shoulder, you should?

A) Use mirrors and turn signals, turn sharply to get back on the road.
B) Use mirrors and turn signals, edge gradually back on the road.
C) Drive on the shoulder till next exit and then re-enter the road.

When driving in cold weather, your tires tread should:

A) Provide enough traction to steer and push the vehicle through the snow.
B) Be double the depth required in normal weather.
C) Be checked every 100 miles or every two hours.

How does vehicle weight affect stopping distance?

A) Fully loaded trucks take longer to stop.
B) It doesn't work the same regardless of the vehicle weight.
C) Empty Trucks can take longer to stop than loaded trucks.

Repeat of question 12

The speed which you drive should not be determined by your:

A) Schedule
B) Visibility
C) Engine type

Which of the following is true about preventing fatigue on a long trip?

A) Stop periodically for rest and exercise.
B) Keep the vehicle closed and heated.
C) Take an over the counter stimulant.

Convex(curved) mirrors:

A) Make objects appear larger than they really are.
B) Make objects appear closer than they are.
C) Show a driver a wider area than flat mirrors.

How far should a driver look ahead of the vehicle while driving?

A) 12-15 seconds
B) 1-2 seconds
C) 5-8 seconds

Which of these is a good thing to remember about drinking alcohol?

A) Small quantities of alcohol improve reaction time.
B) Alcohol first affects judgement and self-control.
C) The driver can control how fast the body gets rid of the alcohol.

When you must leave the road to avoid a hazard or emergency you should keep in mind that?
A) You may be unable to re-enter the road.
B) It is less dangerous to drive onto the shoulder than to risk a collision.
C) Most shoulders are not strong enough to support the weight of a large vehicle.

You should signal continuously while turning because:

A) You need both hands on the wheel to turn safely.
B) Most vehicles have self-canceling signal.
C) Most shoulders are not strong enough to support the weight of a large vehicle.

Which of these systems should receive extra attention during a winter weather inspection?

A) Steering
B) Suspension
C) Exhaust

Repeat of question 43

On which fire can you use water?

A) Tires
B) Gasoline
C) Electrical

The braking effect of the engine is greatest when the engine is _____. The Government RPMs and the transmission is the _____.

A) Below, higher
B) Above, lower
C) Near, lower

Repeat of question 44

A helper should be used to help back your vehicle:

A) Whenever possible
B) When you have a trailer on your vehicle
C) When you need to back on a curved path.

Which of these statements is true about over the counter medicines used to treat the common cold:

A) It can be used while driving if you only take half the regular dosage.
B) It should only be used when driving in daytime.
C) It often makes you sleepy and thus should not be used while driving.

A car suddenly "cuts" in front of you creating a hazard. Which of these actions should you not take?

A) Slow down to prevent a crash.
B) Signal and change lanes to avoid the car, if possible.
C) Honk and stay close behind the car.

Which of these is not true about braking in an emergency situation?

A) Brake in a way that will keep your vehicle in a straight line.
B) Avoid using the brakes until your speed has dropped to 20mph.
C) It is not important how you brake in an emergency situation.

Repeat of question 6

If the anti-lock brake system is not working, you should:

A) Not drive until it is repaired.
B) Drive at a lower speed
C) Drive normally, but get the system service soon.

To determine a person's Blood Alcohol Concentration (BAC) you must know how:

A) Often the person drinks alcohol (tolerant level)
B) Old the person is.
C) Much the person weighs

Repeat of question 4

Whenever you double your speed , your vehicle has about _____ times the destructive power if it crashes.

A) Two
B) Three
C) Four

Which of these items is not checked in a pre-trip inspection?

A) Amount of fuel in the vehicle.
B) Cargo seducement.
C) Whether all vehicle lights are working and clean.

Which of these statements is true about cold-weather driving?

A) Exhaust system leaks are less dangerous in cold weather.
B) An engine cannot overheat when the weather is very cold.
C) Windshield washer anti-freeze should be used.

When you drive in the mountains, you will have to use lower gears to drive safely down grades. Which of these does not affect your choice of gears?

A) Tire tread types
B) Weight of the load
C) Length of the grade

Repeat of question 81

You are driving on a two-lane road. An oncoming vehicle drifts into your lane and is headed straight for you. Which of these is the best action to take?

A) Brake hard
B) Steer to the right
C) Steer onto the left shoulder

When approaching a traffic light that has been green for a long time, you should:

A) Start slowing down so you will be ready to stop
B) Continue at your current speed
C) Accelerate so you get through the light

Repeat of question 39

One reason that dry bulk tanks require special care is:

A) The load can shift
B) They can only be filled halfway
C) They can easily catch fire

Which of these is true about a vehicles overhead clearance?

A) Warnings are always posted for low clearance areas
B) Cargo weight can change your vehicle's height
C) Pavement does not affect the clearance height under bridges or overpasses

Which of these statements is ture about double-clutching and shifting?

A) You can use the tachometer to tell you when to shift
B) Double-Clutching should not be used when the road is slippery
C) County and city laws do not apply to trucks and buses engaged in interstate commerce.

Why is a broken exhaust system dangerous?

A) You could pollute the air with exhaust smoke
B) Oil on the tie rod may catch on fire
C) Poison fumes could enter the cab or sleeper berth.

Which of these statements is true about notifying authorities after a collision occurs?

A) An exact location is not necessary, just identify the road and the vehicles involved
B) If you have a CB radio or a cellular phone, use it to notify the police before exiting your vehicle.
C) You should notify authorities about the collision before doing anything else

How can you identify an impaired driver?

A) The vehicle is drifting across lanes and moving at variable speeds
B) The vehicle is weaving in and out of traffic
C) The vehicle is speeding

When stopped on a one-way or divided highway, you should place reflective triangles at:

A) 10 feet, 100 feet, and 200 feet toward approaching traffic
B) 10 feet, 100 feet, and 500 feet toward approaching traffic
C) 10 feet, 50 feet, and 100 feet toward traffic

Backing a commercial vehicle is:

A) Not dangerous if you have a helper
B) Always dangerous
C) Not dangerous if you do no have to turn

Repeat of question 30

Which statement is true about using engine braking?

A) Engine braking should not be used as the main way to control speed
B) It creates extra heat between the brake shoes or pads and the drum(s) or disks.
C) The use of brakes on a downgrade adds to the braking effect of the engine.

Which vehicle will have the most difficulty staying in its lane during strong winds?

A) Trailer jackknife
B) Hydroplaning
C) Excessive brake wear

Retarders can be used:

A) Only where they are permitted by law
B) Only for downhill braking
C) Only on roads with poor traction

You must stop on a hill or curve on a two-lane, two-way road. How face back should you place your reflective triangles?

A) Within 500 feet behind the vehicle
B) Within 250 feet behind the vehicle
C) As far back as necessary, so others can see your vehicle

What is counter steering?

A) Using the steering axle brakes to prevent over steering
B) Turning the steering wheel back in the other direction after steering to avoid a traffic emergency
C) Turning the steering wheel counterclockwise to prevent over steering.

Repeat of question 40

When driving at night, use your low beams when an oncoming vehicle is within:

A) 400 feet
B) 300 feet
C) 500 feet

Repeat of question 42

Escape ramp:

A) Are designed to slow vehicle's so they can get back on the road at a safe speed
B) Should be used by any driver who loses braking power on a vehicle
C) Are not designed for trucks with double trailers

A round, black-on-yellow warning sign means:

A) School crossing ahead
B) Slow down, look and listen, and be prepared to stop if a train is approaching
C) Low overpass ahead

After starting the engine, the:

A) Oil pressure gauge should take 3-5 minutes to rise to normal
B) Coolant temperature gauge should begin a gradual rise to normal
C) Engine temperature gauge will take 3-5 minutes to rise to normal

Which of these is not required knowledge for driver needing HazMat endorsement?

A) When to use placards
B) Which products can be loaded together
C) Basic chemistry

Repeat of question 17

Which of the following is not a characteristic of a front tire failure?

A) Vehicle fishtail
B) Difficult steering
C) Steering wheel twisting

If you have a load that is slowing you down on a upgrade, you should:

A) Drive on the shoulder so other can pass easily
B) Exit the road until traffic is lighter
C) Shift into a lower gear

Repeat of question 52

When you are parked at the side of the road at night, you must?

A) Use your taillights to give warning to other drivers
B) Put out your emergency warning devices within 30 minutes
C) Turn on your 4-way emergency flashers to warn others

If you must cross into the oncoming lane as you make a turn, you should:

A) Back up to allow oncoming traffic to pass
B) Watch for oncoming traffic
C) Complete your turn without stopping

What does emergency braking mean?

A) Using the vehicle's emergency brake
B) Responding to a hazard by slowing the vehicle
C) Pushing down on the brake pedal as hard as you can

Over-length, over-width, or over-weight loads:

A) Must be escorted by police
B) Can only be driven in daylight
C) Require Caltrans transit permits

A pre-trip inspection should be completed:

A) At least once a week
B) If any problems occurred the last time the vehicle was operated
C) Before operating the vehicle

What should you do when you are driving at night?

A) Make sure you are driving slow enough so you can stop within the range of your headlights in an emergency
B) Roll down your window so that the fresh air will help keep you awake
C) If you are sleepy, drink coffee or other caffeine products

Which of the following is the correct term for a long commercial vehicle's tendency to swing wide turns?

A) Sidetracking
B) Off tracking
C) Fishtailing

When a coolant container is part of a pressurized system, you can:

A) Check the coolant level of a hot engine
B) Safely remove the radiator cap and add coolant while the engine is hot
C) Use water only in the cooling system

Repeat of question

While doing the pre-trip inspection on your vehicle's steering and exhaust system you the found the following problems. Which one, if any, should be fixed before you drive the vehicle?

A) Too many vertical stacks
B) Oil on the tire rod
C) Play in the steering wheel of more than 10 degrees( 2 inches on a 20-inch steering wheel)

Containerized loads:

A) Are exempt form hazardous materials restrictions
B) Are exempt from weight limit restrictions
C) Generally are used when freight is carried part way rail or ship

You are exiting a highway using an off ramp that curves downhill and you are driving a heavy vehicle . You should : 

A) Do nothing because the post speed limit for the off ramp is usually 10 miles per hour below the safe speed limit for the off ramp 
B) Slow to a safe speed before the curve
C) Down shift after you are in the curve

Water can safely be used on which of these fires?

A) Electrical 
B) Gasoline 
C) Neither of the above

Three thins add up to the total stopping distance for you vehicle . They are: 

A) Perception distance, Reaction distance, breaking distance
B) Observation distance, Reaction distance, slowing distance
C) Perception distance, Response distance, Reaction distance

You are about to go down a long, Steep downhill grade in a newer truck, You should : 

A) Use lower gear than you would be use to climb the uphill grade 
B) Use the gear you would use to climb the upgrade hill 
C) Use the higher gear than you would use to climb a uphill grade

Which of these items is checked in a pre-trip inspection?

A) Cargo securment 
B) whether all the vehicle lights are working and clean 
C) Both of the above

If you are stopped in a one way or divided highway, you should place reflection triangles at:

A) 10 feet, 100 feet, and 200 feet towards approaching traffic 
B) 25 feet, 100 feet, and 250 feet towards approaching traffic 
C) 50 feet, 100 feet, 300 feet towards approaching traffic

When a heavy fog occur you should :

A) Use high beams for the best visibility 
B) park off to the right side of the road with your parking lights on 
C) Park at a rest stop until the fog has lifted

You should plan ahead when you park your vehicle so that:

A) It will be very easy for you to check you vehicle before you get on the road 
B) You are only required to pull forward when you leave 
C) You don't need to back up more than ten feet

The term " Gross combination weight " refers to that : 

A) Total weight of powered unit and the trailer 
B) Total weight of the trailer and the load 
C) Total weight of a powered unit, the trailer and the cargo

A driver should look ____ ahead of the vehicle while driving .

A) 2-5 seconds 
B) 5-10 seconds 
C) 12-15 seconds

Which of the following statements is true about the overhead clearance ? 

A)Posted signs for the overhead clearance are always correct 
B) Paving a road does not affect the clearance height of your vehicle 
C) Cargo weight may change the height of your vehicle

Which of the statements is true when you are performing a pre-trip inspection on your brake and suspension system ?

A) Brake shoes should be free of oil grease and break fluid 
B) One missing leaf spring is not dangerous 
C) A cracked spring is not dangerous

A broken exhaust system is dangerous because ?

A) Exhaust noise will damage the driver's ears 
B) Toxic fumes and gasses could enter the cab or sleeper berth 
C) The leaking exhaust smoke pollutes the air