Washington CDL DMV Knowledge Test Class A 1

A faulty exhaust system is a serious safety hazard. It may allow poisonous fumes to enter the vehicle's cab or sleeper berth.

To avoid hitting vehicles behind you, you must ensure that your vehicle will not roll backward when you start moving forward from a stopped position.

The safety valve protects air tanks and the rest of an air brake system from accumulating too much air pressure. The safety valve is usually set to open at 150 psi.

If your vehicle has air brakes, the air compressor drive belt should be checked before each drive. Check the tightness of the belt and verify that it is in good condition.

You will be denied a hazardous materials endorsement, or lose an existing endorsement, if you renounce your U.S. citizenship; are not a lawful permanent U.S. resident; are wanted for, indicted for, or convicted of certain felonies; are judged mentally defective or are committed to a mental institution; or are deemed by the Transportation Security Administration (TSA) to pose a security threat.

A vehicle's regular stopping distance increases on slippery surfaces because there is less available traction.

All states share driver information through a computerized database in order to prevent the issuance of multiple licenses to a single person. It is prohibited for a person to have more than one driver license.

While driving, spring brakes are generally held in place by air pressure. If the air pressure gets low enough, the springs will activate the brakes.

The total stopping distance for vehicles equipped with air brakes is made up of four factors: perception distance, reaction distance, brake lag distance, and braking distance. When braking at a speed of 55 mph while driving on dry pavement, the brake lag can add around 32 feet to the vehicle's total stopping distance.

When exiting your vehicle during the basic vehicle control skills test, you must face the vehicle and maintain three points of contact at all times. If your testing vehicle is a bus, you must maintain contact with the handrail. Exiting the vehicle incorrectly may result in automatic failure of the basic vehicle control skills test.

Driving at night is more dangerous than driving during the day because hazards become more difficult to see in the dark.

If you are applying for your first CDL, or you have not been commercially licensed for the past year, you must provide proof of completing a commercial driver training program from a state-approved training school or registered employer.

If your drive wheels begin to spin while accelerating on a surface with poor traction, you should remove your foot from the accelerator.

Use your low beam headlights when traveling near other drivers at times when it is difficult to see, such as at dawn, at dusk, or in poor weather conditions. Using the high beam setting under certain conditions could make it difficult for other drivers to see.

Cargo should be restrained by at least one tie-down for every 10 feet of cargo. However, all cargo should have at least two tie-downs, no matter the size of the cargo.

During a pre-trip inspection, be sure to check the mirrors and windshield for dirt and anything else that could interfere with your ability to see. Clean them as necessary.

It is essential that you are aware of what is happening on all sides of your vehicle at all times. Scan the road ahead and make regular checks of the mirrors on both sides of your vehicle while you are driving.

If you are convicted of any kind of traffic violation in any type of vehicle, you must notify your employer within 30 days of the incident. You must also inform your motor vehicle licensing agency within 30 days if the incident happened in another jurisdiction. This rule does not apply to parking infractions.

An operator should drive with care when transporting a cargo of hanging meat. Such a load is unstable, both because it has a high center of gravity and because the swinging of the meat can affect the driver's handling of the vehicle.

During a pre-trip inspection, you should check for emergency equipment, including spare electrical fuses; three red reflective triangles, six fuses, or three liquid burning flares; and at least one properly charged and rated fire extinguisher.

In Washington State, there are limits to the number of hours a driver may drive during a seven- or eight-day period. A commercial driver who reaches the end of a duty period may begin a new seven- or eight-day period after taking at least 34 consecutive hours off.

Brake linings should not be loose or soaked with oil or grease. They shouldn't be dangerously thin.

You may be asked to complete a parallel parking maneuver into a parking space that is to the left of your vehicle. You should drive past the parking space before backing into it while bringing the rear of your vehicle as close to the rear of the space as possible. Your vehicle should be completely within the boundaries of the space.

Truck tractors with air brakes built on or after March 1, 1997, and other vehicles with air brakes built on or after March 1, 1998, must be equipped with anti-lock brakes.

On long and/or steep downgrades, you should primarily use engine braking to control the speed of your vehicle. Use your brakes only as a supplement to this effect.

When approaching your vehicle, you should check under the vehicle for fresh oil, coolant, grease, or fuel leaks. Spotting any of these before a trip is a cause for concern.

Hydroplaning occurs on surfaces where water has collected. If there is enough water, vehicles can hydroplane at speeds as low as 30 mph. Hydroplaning becomes more likely if tires are under-inflated or if the tread is worn.

An Anti-Lock Braking System (ABS) intervenes to reduce brake pressure if there is a risk of wheel lockup. If the ABS isn't working, the vehicle's basic braking functions are not affected. A driver should continue to drive and brake in a normal manner.

Pressing and releasing the brake pedal unnecessarily can let air out of the braking system faster than the compressor can replace it. Air brakes may cease to work effectively if the pressure becomes too low.

During the on-road driving test, the examiner will be score you on specific driving maneuvers as well as on your general driving behavior. You must drive in a safe and responsible manner; obey all traffic signs, signals, and laws; and not cause an accident or commit a moving violation.

Under slippery conditions, you should drive slowly and smoothly. Make turns as gently as possible and do not pass other vehicles unless you have to.

The best thing to do when confronted with an aggressive driver is to get out of their way, if possible. Avoid making eye contact, which could further provoke the driver. Ignore any hand gestures made by the driver.

Most states have an Implied Consent Law, which means that by driving a vehicle on the state's roads, you have agreed to undergo a drug or alcohol test if a police officer asks you to do so. If you refuse to submit to a test, you will lose your operating privileges. Make sure you are aware of the laws for every state in which you drive.

As you exit your vehicle during the basic vehicle control skills test, you must face the vehicle and maintain three points of contact at all times. If your testing vehicle is a bus, you must maintain contact with the handrail. Exiting the vehicle incorrectly may result in automatic failure of the basic control skills test.

An encroachment during the basic vehicle control skills test is when an exercise boundary line is touched or crossed by any portion of the applicant's vehicle. Every encroachment will be counted as an error.