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Question:

If you are going to stop or slow down where others might not expect it, you should _________ to warn those behind you.

A tap your brake pedal three or four times quickly
Explaination

Your brake lights let others know that you are slowing down. If you are going to stop or slow down where others might not expect it, warn those behind you by quickly tapping your brake pedal three or four times to flash your brake lights.