How can you help prevent a jackknife?

a.Brake hard going into curves

b.Avoid over-braking, over-steering, and maintain proper speed for conditions

c.Always use the trailer hand valve when slowing down

d.Drive faster to maintain momentum

Explanation

To prevent jackknifing, avoid over-braking, over-steering, and always travel at speeds appropriate for road and weather conditions. Sudden braking or turning can cause the drive wheels to lose traction and the trailer to push the tractor sideways.

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About the CDL Exam

The CDL (Commercial Driver License) exam tests your knowledge of commercial driving rules, safety procedures, and vehicle operation. You must score 80% or higher to pass the written knowledge test. The exam covers general knowledge, air brakes, combination vehicles, and various endorsements.

This question is from the CDL Combination Test #1 section. Practice with more questions from this category to build confidence before taking the official DMV test.

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