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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Washington CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the Washington CDL Manual. Take this practice test now to prepare for the actual WA CDL combination test!
1. If you are being tailgated, you should:
speed up.
move to the left lane.
increase your following distance.
2. How many red reflective triangles should you carry?
3. Emergency brakes are:
not required on buses.
required on all vehicles.
not required on doubles.
4. Which of these statements is true?
Trailer skids are more likely to happen when the trailer is empty or lightly loaded.
"Bobtail" tractors can take longer to stop than a combination vehicle loaded to maximum gross weight.
Large combination vehicles take longer to stop when they are fully loaded than when they are empty.
5. Glad hands are:
warning devices.
coupling devices.
securement devices.
6. An Anti-lock Braking System (ABS):
lets you drive faster.
increases your normal braking capability.
keeps your wheels from locking up when you brake hard.
7. When backing a tractor under a trailer, you should:
back at an angle.
stop before when the kingpin is locked into the fifth wheel.
always use the lowest reverse gear.
8. If your trucks has a high center of gravity, which of the following is true for curves?
You should travel at the posted speed limit.
Reduce your speed to a crawl.
You should slow down, as your truck can roll over at the posted speed limit for the curve.
9. If you are feeling sleepy, you should:
slow down and drive on the shoulder of the road.
pull off the road and rest or take a nap.
increase your speed to get to the destination quicker.
10. As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
air escaping from the open valve.
a mechanical vibration.
the service line valve close.
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WA Combination Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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