ChatterBank2 mins ago
Why do the do it ?
Answers
No best answer has yet been selected by derekpara. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.'Brake testing' the driver behind you as described by mfewell is a potentially dangerous manoeuvre, especially if you "stamp on your brakes very hard", as this could result in that vehicle trying to enter the rear of yours at 70+mph.
Seasoned practitioners of this art use their left foot to just tap the brake pedal sufficiently hard to activate the brakelights, their right foot remaining on the accelerator pedal to maintain their speed. This requires much practice since most drivers of manual cars are initially incapable of lightly depressing the pedal using their left foot, so used are they to fully depressing the clutch pedal.
But this is still potentially dangerous!
Why do they do it? Because they are a***holes. Usually driving BMWs.
What are they trying to do? Get you to speed up (and break the law) and/or get out of their way as they obviously own the road.
What is the solution? I would favour rear-mounted rockets, but they are illegal. I usually carry on at the legal speed limit; they can wait.