This won't really work until everyone has better cars.
It's going to be a lot easier for the on-board computers to stay a distance of x away from the car in-front/behind/at both sides when they can talk to the computers in all those other cars. Until then the AI is expected to keep you safe whilst surrounded by unpredictable human driven cars. That's too tall an order in my opinion. If I crash my car into yours we blame each other and our insurance sorts it out. If my AI car crashes into you, it's all over the media, the manufacture goes out of business, prices skyrocket, blame is allocated to the AI.. autopilot is the worst thing to offer drivers as history has shown.