General Knowledge9 (Drivingtests.org)

You can use your retarder:

only on slippery roads.
only when traveling downhill.
only where allowed by law.

Why will your vehicle’s speed naturally increase on downgrades?

Lack of traction.
Smoother engine performance.
Gravity.

You may get hung up on railroad tracks if:

You cross double tracks too slowly.
The tracks have a steep approach.
You try to shift gears when crossing.

If you park at the side of the road, you should:

Set out your emergency warning devices within 30 minutes.
Keep your vehicle's taillights on.
Turn on your four-way flashers.

You are driving a tractor-trailer at 55 mph on dry pavement. About how much total distance will you need to bring it to a stop?

The length of a football field.
Twice the length of the vehicle.
Half the length of a football field.

Why can tourists be hazards?

They may drive slowly and make sudden stops or lane changes.
Law enforcement officers will not give them a ticket.
They often drive rental cars.

Which of these statements about tires is true?

The air pressure of a tire decreases as the temperature of the tire increases.
In very hot weather, you should inspect your tires every two hours or every 100 miles.
If the tires are too hot to touch, let 5–10 pounds of air pressure out to cool them down.

Under which of the following situations must you stop at a railroad grade crossing?

The cargo you're carrying makes stopping mandatory under federal or state regulations.
There are no warning devices or flag persons at the grade crossing.
Traffic is heavy on the road you are driving on.

Your vehicle has hydraulic brakes. While traveling on a level road, you press the brake pedal and find that it goes to the floor. Which of these statements is true?

Pumping the brake pedal may raise hydraulic pressure so you can stop the vehicle.
The parking brake will not work either because it is part of the same hydraulic system.
Shifting into neutral will help slow the vehicle.

When you drive on roads whose speed limits for CMVs are lower than for cars, you should:

Drive at about the same speed as the other CMVs.
Use extra caution when you change lanes or pass.
Ignore reduced speed signs.

Which of these vehicles is most likely to be affected by strong winds?

A tractor pulling empty doubles.
A straight truck loaded with cargo.
A tractor pulling a loaded flatbed.

Your tractor-trailer’s brakes can get wet when you drive through heavy rain. What can this cause when you apply the brakes?

Trailer jackknife.
Hydroplaning.
Excessive brake wear.

If you must take emergency action to deal with a hazard, you should remember which of the following?

To turn quickly, keep a firm grip on the steering wheel.
You can almost always stop more quickly than you can turn.
Stopping is always the safest thing to do.

Which of these would probably NOT help if your windshield became covered with ice?

Scraper.
Brush.
Defroster.

How should you merge safely onto a freeway or expressway?

Accelerate on the shoulder to highway speed before you merge.
Wait for a large enough gap in traffic in the nearest lane before you merge.
Edge slowly into the nearest lane to force other drivers to leave you room.

In a moving vehicle, you should wear your seatbelt:

only when traveling on a highway.
at all times.
only when you are driving.

If you are confronted by an aggressive driver, what is the most important thing you should do?

Stand your ground.
Get out of the driver's way.
Signal to the driver that you made a mistake.

You are starting your vehicle in motion from a stop. As you apply power to the drive wheels, they start to spin. What should you do?

Try a lower gear.
Take your foot off the accelerator.
Take your foot off the accelerator and apply the brakes.

To drive down a mountain road safely, you’ll have to downshift into lower gears. Which of these should NOT affect your choice of gears?

Length of the downgrade.
Weight of the load.
Type of tire tread.

You are checking your brakes and suspension system during a pre-trip inspection. Which of these statements is TRUE?

Just one missing leaf spring is not dangerous.
Brake shoes should not have oil, grease, or brake fluid on them.
Spring hangers that are cracked but still tight are not dangerous.

If you must stop your vehicle beyond a curve that hides your vehicle from other drivers within 500 feet, place a reflective triangle:

up to 500 feet behind the vehicle.
up to 200 feet behind the vehicle.
as far back as necessary to warn other drivers.

Perception distance is the distance that your vehicle travels:

From the time that your eyes see something, to the time that you start to press the brake pedal.
From the time that your eyes see something, to the time that your brain recognizes it.
From the time that your brain decides to brake, to the time that you start to press the brake pedal.

If your truck is transporting cargo, you must check the securement of the cargo within the first ____ miles of the trip.

50
100
150

If you must use a hand-held cell phone while you’re driving, what should you do?

Slow down.
Stop in a safe and legal location.
Position the phone so you can see the road in front of you.

ABS uses computers and sensors to determine:

When a wheel may lock up.
The condition of the roadway surface.
The condition of the brakes.

You are driving a tractor-trailer. If the tractor has antilock brakes (ABS) but the trailer doesn’t:

The chance of a rear-wheel skid will increase.
You will have more control over the vehicle than if the tractor lacked ABS.
The chance of jackknifing will increase.

Which of the following statements about hazardous materials placards is true?

They must be affixed only to the front and rear of a vehicle.
They must be affixed to every vehicle transporting hazardous materials.
They must be affixed to all four sides of a vehicle.

A load that is over-length, over-width, or overweight:

requires a police escort or pilot vehicles.
requires a special transit permit.
can only be transported on freeways.

If you must care for the injured at an accident scene, you should NOT:

move severely injured persons if there is a danger from fire or passing traffic.
allow injured persons to become chilled.
stay out of the way if a qualified person is already helping them.

You are driving at 50 mph on a straight, level highway. There are no vehicles in front of you. Suddenly a tire blows out in your vehicle. What should you do first?

Begin emergency braking.
Begin light braking.
Stay off the brake until your vehicle has slowed down.

What is aggressive driving?

Driving in a selfish or pushy manner.
Driving while your attention is directed elsewhere.
Intentionally driving to harm someone.

When you drive through a work zone, you should:

Turn on your parking lights.
Increase your speed if no construction is currently taking place.
Slow down even more when workers are present.

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

at least 0.02%.
at least 0.04%.
any detectable amount.

Which of the following is true about using a heater while you’re driving in winter weather?

Federal regulations require mirror heaters in below-freezing weather.
If you feel drowsy, warm up your cab with the heater.
Before you drive, make sure that the cab heater is working.

Which of the following statements about downshifting is true?

Downshift after you've entered a curve.
Downshift before you enter a curve.
When double clutching, let the engine slow down while the transmission is in neutral and the clutch is released.

Which of the following is true about using engine braking on a downgrade?

Engine braking creates extra heat between the brake shoes or pads and the drums or discs.
You should NOT use engine braking as the main way to control speed.
The use of brakes adds to the braking effect of the engine.

How should you react to an aggressive driver?

Smoke a cigarette to relax.
Give the driver the benefit of the doubt.
Eat a snack to raise your blood sugar level.

Which of these statements about marking a stopped vehicle is true?

Keep your vehicle's taillights on to warn other drivers.
You must set out your emergency warning devices within 5 minutes.
If a hill or a curve keeps drivers behind you from seeing your vehicle within 500 feet, move the rear reflective triangle back down the road to give adequate warning.

Which of these statements about controlling your vehicle’s speed is true?

Fully loaded trucks require greater stopping distances than empty trucks.
Choose a speed that lets you stop within the distance you can see ahead.
If you double your speed, it will take you twice as long to brake to a stop.

General Knowledge9 (Drivingtests.org)

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