The truth is, we already have enough road. Compared to machines, our reaction times are very slow, and because of that we can't use them efficiently since we ne

The truth is, we already have enough road. Compared to machines, our reaction times are very slow, and because of that we can't use them efficiently since we need to give each other space to slow down / change lanes. If the cars are able to communicate their intended destinations along with other things ("I'm speeding up, go" / "I'm slowing down, don't hit me" / "SYSTEM FAILURE") then we can pack more cars into the same amount of space.