I don't think that autonomous cars are anywhere near a situation where a large scale deployment is feasible. In particular, I think that there needs to be a cro

I don't think that autonomous cars are anywhere near a situation where a large scale deployment is feasible. In particular, I think that there needs to be a cross-vendor car-to-car or car-to-road communication protocol. Until then, autonomous cars will only work as long as there are relatively few of them or they run in controlled conditions like major highways. When I'm in traffic, I notice myself communicating with other people a lot. Most commonly it's just brief eye contact ("I have seen you"), but it enables smooth and safe traffic for everyone. Just blindly following rules and reacting to your immediate surroundings won't work in large scale. There are plenty of situations where that would end up in a deadlock traffic jam (e.g. 4 way intersection with no right of way). This is by no means an impossible task, I just have not heard of an effort trying to solve it yet.