Why do experienced combination drivers plan lane changes earlier and make them more gradually than car drivers?

A.A gradual change keeps trailer swing small and gives the combination time to settle between moves
B.Gradual changes are only for appearances
C.Early planning is required by the horn rule
D.Trailers follow instantly with no lag

Correct answer

A. A gradual change keeps trailer swing small and gives the combination time to settle between moves

Why

A trailer lags behind the tractor and then swings past center before settling. Slow, early moves keep that natural swing well inside safe limits.

Manual topic: Combination Vehicles - Rollover and Rearward Amplification · From the Combination Vehicles practice bank (CV-082).