[tobz]

It warned about a forward collision with a car that the driver couldn't even see.

Watching closely, the red car directly in front does not appear to slow down measurably, and certainly, their brake lights do not light up. You do, however, see the black SUV's brake lights light up.

Prediction is a strong word, to be sure. It's great when it's right, and annoying when it's wrong -- like car alarms -- but if it it fires some portion of the time when there is an actual accident imminent -- like a smoke alarm -- then it's clearly useful.