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When you need to brake, how can you warn drivers behind you?
A.  Tap on the brakes a couple of times.
B.  Stick your arm out the window.
C.  Swerve within your lane.
D.  Change lanes.
To warn drivers behind you that you are about to slow down, it may be a good idea to first lightly tap your brake pedal a few times to make the brake lights flash.
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