Well before any turn or lane change, and signal long enough to communicate

CDL Practice Question #65

You should signal:

Only when other vehicles are visible
Continuously while driving
Well before any turn or lane change, and signal long enough to communicate
Only when changing lanes left

Correct. Signal early, signal long enough that other drivers see and process the signal, and cancel after the maneuver.

Why this question matters

This question is one of 97 in our General Knowledge bank. The reasoning above comes directly from the AAMVA CDL Manual, the source document used by every U.S. state DMV. Memorizing the underlying rule — not just the letter answer — is what separates passing on the first attempt from a return trip and another fee.

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