[Superman]

It's not just the speed delta. Sure, the speed delta is probably the biggest variable when it comes to creating danger, but pure speed can certainly be a big issue also. Most people do not realize how close they already are to the physical limits of the car and tires. At 70 mph in the rain, Seattle drivers tailgate and pretend it's summer time. At that speed, in those conditions, they are just about to lose control. One quick jerk of the steering wheel and they'd be swapping ends.

On warm dry pavement it's different, but perhaps not as much as folks think. At 120 mph, it doesn't take much to get sideways. Stopping distances, I believe, lengthen according to the square of the increased speed. It takes a LONG..........LONG distance to stop from 120 mph.