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.

Refrain from passing slower vehicles.

Make turns as quickly as possible.

Refrain from passing slower vehicles.

In an air brake system, a low air pressure warning signal must come on if air pressure in the tanks falls below 60 psi. This warning signal may come in the form of a light, a buzzer, or a wig wag.

When tank pressure falls below 60 psi.

When tank pressure falls below 120 psi.

When tank pressure falls below 60 psi.

When tank pressure falls below 10 psi.

If you observe a crash involving an aggressive driver, you should stop a safe distance from the crash scene, wait for police to arrive, and inform them of the aggressive behavior you witnessed.

Stop after the crash scene and report the other driver’s behavior to police.

Block the driver in with your vehicle.

One way to know when it is time to shift gears is to learn your vehicle's operating rpm range. You should shift up when your engine reaches the top of that range. You can also learn which speeds each gear is good for and shift up based on your speedometer.

The actions of the vehicle next to you.

The speed of your engine (rpm).

The actions of the vehicle next to you.

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.

The vehicle will still be able to brake.

The vehicle will have no brakes.

The vehicle will still be able to brake.

The vehicle will likely travel faster than usual.

In a vehicle with dual parking control valves, there is a separate air tank that can be used to temporarily release the spring brakes if they have been activated due to low air pressure. Pushing in the proper control will release the spring brakes for a short period of time, allowing the driver to move the vehicle in an emergency.

To temporarily release the spring brakes.

To make the air brakes work more effectively.

To temporarily release the spring brakes.

To charge the brakes on the rear trailer.

Blocking may be used on all sides of a piece of cargo to keep it from sliding while the vehicle is in motion.

Prevent cargo from sliding in a trailer.

Prevent cargo from falling out of a trailer.

Class B Driving Test | Washington 2025 #1 Page 7 of 7

Train for FREE online with our Washington class B license test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a WA CDL class B permit in 2025, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that CDL class B requirements may vary from state to state.

Number of Question 50

Passing Score 40

Number of Tests 20

Class B Driving Test | Washington 2025 #1 Page 7 of 7

43 . On a slippery road, a driver should:

44 . A low air pressure warning signal should activate:

45 . If an aggressive driver is involved in a crash down the road, you should:

46 . What is the maximum legal weight to be placed on a single axle?

47 . Do not base your decision to shift gears on:

48 . If a vehicle's Anti-Lock Braking System (ABS) is malfunctioning:

49 . In a vehicle with dual parking control valves, a separate air tank can be used:

50 . Blocking is used to:

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