If you plan to slow down, you can warn drivers behind you by:

Question

Before slowing down, it is a good idea to flash your brake lights by lightly tapping your brake pedal a few times. This will warn drivers behind you of your plans to slow down.

Accepted Answer

Tapping the brakes a few times and before braking.

Answer

Slamming on the brakes.

Answer

Turning on one set of turn signals.

Answer

Putting your hand out the driver's side window and waving.