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

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