[monk_e_boy]

We have variable speed limits here in the UK. During rush hour the speed will change (enforceable using cameras and fines) they also monitor the roads for these shock waves and alter the speed limit to reduce them.

We also have variable lanes, or tidal lanes. So a 3 lane road will have 2 lanes into and one lane out of the city in the morning and in the evening one lane in and 2 lanes out. Makes the most use of road space.

I imagine with more autonomous cars lanes and speed limits will become a thing of the past. Computers will just pack cars onto a road in the most efficient way possible.