To warn other drivers of a collision ahead, you should:

Ease off the gas pedal and avoid using your brakes.
Pump your brakes and dim your lights to low beam.
Turn on your high-beam headlights and sound your horn.
Turn on your emergency flashers or flash your brake lights.
Explanation

Warning other drivers of a potential collision ahead is crucial for preventing accidents. If you see a potential hazard on the road ahead, you should warn the drivers behind you by turning on your emergency flashers or tapping your brake pedal quickly 3 or 4 times. Both actions can give drivers behind you enough time to slow down or react accordingly, potentially avoiding a collision.

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