Pino, how about a poll on this for fun.

My great idea:

My Nissan Titan pickup has a sonar or radar built into the rear bumper that activates when the truck is in reverse. When an object is in range it beeps and beeps faster as you get closer to the object and finally becomes a steady tone a few inches before impact. With mirror visibility being so bad in F1 it seems like a "U" shaped ring of sensors going from the driver's right blind side around the back of the car to the left blind side could be installed with lights on the steering wheel and a warning tone in the earphones. A driver hearing the tone could check his wheel, see a flashing light on the right side of the wheel and would know there was a car there and movement to that side might result in contact.

Might work pretty well.