Free CDL Practice Test

Correct!
C. turn on your four-way emergency flashers.

Explanation:
When you pull off the road and stop, be sure to turn on the four-way emergency flashers. This is important at night. Don't trust the taillights to give warning. Drivers have crashed into the rear of a parked vehicle because they thought it was moving normally. If you must stop on a road or the shoulder of any road, you must put out your emergency warning devices within ten minutes.

In the handbook:
2.5.2: Communicating - Communicating Your Presence

Correct!
C. To use the parking or emergency brake to slow the vehicle, be sure not to press the release button or pull the release lever at the same time you use the emergency brake.

Explanation:
Brakes kept in good condition rarely fail. Most hydraulic brake failures occur for one of two reasons: loss of hydraulic pressure or brake fade on long hills. When the system won't build up pressure, the brake pedal will feel spongy or go to the floor. You should downshift, pump the brakes, use the parking brake, and find an escape route. Putting the vehicle into a lower gear will help to slow the vehicle. Sometimes pumping the brake pedal will generate enough hydraulic pressure to stop the vehicle. The parking or emergency brake is separate from the hydraulic brake system. Therefore, it can be used to slow the vehicle. However, be sure to press the release button or pull the release lever at the same time you use the emergency brake so you can adjust the brake pressure and keep the wheels from locking up. While slowing the vehicle, look for an escape route--an open field, side street, or escape ramp. Turning uphill is a good way to slow and stop the vehicle. Make sure the vehicle does not start rolling backward after you stop. Put it in low gear, apply the parking brake, and, if necessary, roll back into some obstacle that will stop the vehicle. Going slow enough and braking properly will almost always prevent brake failure on long downgrades. Once the brakes have failed, however, you are going to have to look outside your vehicle for something to stop it. Your best hope is an escape ramp. If there is one, there'll be signs telling you about it. Use it. Ramps are usually located a few miles from the top of the downgrade. Every year, hundreds of drivers avoid injury to themselves or damage to their vehicles by using escape ramps. Some escape ramps use soft gravel that resists the motion of the vehicle and brings it to a stop. Others turn uphill, using the hill to stop the vehicle and soft gravel to hold it in place. Any driver who loses brakes going downhill should use an escape ramp if it's available. If you don't use it, your chances of having a serious crash may be much greater. If no escape ramp is available, take the least hazardous escape route you can--such as an open field or a side road that flattens out or turns uphill. Make the move as soon as you know your brakes don't work. The longer you wait, the faster the vehicle will go, and the harder it will be to stop.

In the handbook:
2.17.3: Driving Emergencies - Brake Failure

Correct!
D. slow, gain

Explanation:
You must understand basic cargo safety rules to get a CDL. If you load cargo wrong or do not secure it, it can be a danger to others and yourself. You must keep weights within legal limits. States have maximums for GVWs, GCWs, and axle weights. Often, maximum axle weights are set by a bridge formula. A bridge formula permits less maximum axle weight for axles that are closer together. This is to prevent overloading bridges and roadways. Overloading can have bad effects on steering, braking, and speed control. Overloaded trucks have to go very slowly on upgrades. Worse, they may gain too much speed on downgrades. Stopping distance increases. Brakes can fail when forced to work too hard. During bad weather or in mountains, it may not be safe to operate at legal maximum weights. Take this into account before driving.

In the handbook:
3.2.2: Weight and Balance - Legal Weight Limits

Correct!
D. none of the above

Explanation:
Many drivers forget about the space under their vehicles. That space can be very small when a vehicle is heavily loaded. This is often a problem on dirt roads and in unpaved yards. Don't take a chance on getting hung up. Drainage channels across roads can cause the ends of some vehicles to drag. Cross such depressions carefully. Railroad tracks can also cause problems, particularly when pulling trailers with a low underneath clearance. Don’t take a chance on getting hung up halfway across.

In the handbook:
2.7.5: Managing Space - Space Below

Correct!
C. notify emergency services of your problem and your location.

Explanation:
Knowing how to fight fires is important. Drivers who didn’t know what to do have made fires worse. Know how the fire extinguisher works. Study the instructions printed on the extinguisher before you need it. Here are some procedures to follow in case of fire. The first step is to get the vehicle off the road and stop. Park in an open area, away from buildings, trees, brush, other vehicles, or anything that might catch fire. Don't pull into a service station! Notify emergency services of your problem and your location. Before trying to put out the fire, make sure that it doesn't spread any further. With an engine fire, turn off the engine as soon as you can. Don't open the hood if you can help it. Shoot foam through louvers, radiator, or from the vehicle’s underside.

In the handbook:
2.21.3: Fires - Fire Fighting

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