LONG DISTANCE CAR RADAR:

Today's systems can dramatically reduce your risk of rear-ending someone else's car, and when most cars have such radars, they will also be much less likely to rear-end you. Once every vehicle on the road is able to sense and avoid others, there'll be no reason why they won't be able to negotiate tailing distances among themselves. Eventually, they might even be sending radio messages about their intentions to one another and to monitors on the roadway over ad hoc communication networks. Smart roads may thus emerge organically.

I like cruise control, too, but I don't give it full responsibility for driving the car.