Home › CDL Practice Tests › Combination Vehicles Questions › Question 75
A quick double lane change to avoid debris is especially risky for a combination because:
- A.Debris cannot damage a trailer
- B.Lane changes are always safe at low speed only
- C.The tractor will always recover first
- D.The second steering input amplifies the trailer swing started by the first, creating a crack-the-whip effect
Correct answer
D. The second steering input amplifies the trailer swing started by the first, creating a crack-the-whip effect
Why
Each rapid direction change adds energy that grows toward the rear trailer. If traffic and space allow, a controlled stop or a single gentle move is far safer than a violent swerve.
Manual topic: Combination Vehicles - Rollover and Rearward Amplification · From the Combination Vehicles practice bank (CV-075).