I agree. The only problem is that you still need to leave room in case something catastrophic happens in front of you (deer, tire flat, etc.) Of course, if the system detects these events as slowing down of one vehicle, it could quickly slow others down, so you'd need less distance than with a human driver. But it only works so far. There are laws of physics dictating the distance needed if one vehicle has a sudden deceleration, and without sufficient distance you'd end up with one spectacular pileup.