cdl practice test

Combination Vehicles CDL Test


Question #1 of 49

Why should you never use the trailer handbrake to straighten out a jackknifing trailer?


The trailer wheels caused the skid in the first place. Once the trailer wheels grip the road again, the trailer will start to follow the tractor and straighten out.

The tractor wheels caused the skid in the first place. Once the trailer wheels grip the road again, the trailer will start to follow the tractor and straighten out.

The tractor wheels caused the skid in the first place. Once the trailer wheels grip the road again, the trailer will start to push the tractor and straighten out.

This is the only time that you should use the trailer brake.

None of the above.



About this Combination Vehicles CDL Test

Our combination vehicle CDL practice test is graded for you at the end of the test based on the percentage of correct test answers. You will also be able to see user statistics which will show you how many people answered a particular combination vehicle question correctly or incorrectly. Take this practice test until you get a perfect score.



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