Why do the brake lights flash?

[Phooey]

What does it mean when the brake lights flash like on the gen2 997 turbo in this clip - http://www.youtube.com/watch?v=qkWsafjJTMk

It's not the first time i have seen a gen2 with flashing brake lights

[Phooey]

Martian O said:

It's only because of the camera shutter speed, your eye wouldn't actually recognise the flashing in real life.

Well bugger me. I would of never of thought that.