Comment Wait for lane speeds (Score 1) 732
This measure probably won't happen. I don't think it will fly, because it offers no incentive, it's just a restriction.
Though eventually, we'll likely see single lane speeds on (for instance) 3 or 4 lane highways, you pick a lane, and the speed control system in your car sets your speed to match all the other vehicles in that lane, and maintain separation distance. The optimal speed would be chosen by the traffic system. Drivers without automatic speed controls will have to match lane speed and separation, or use the one (or two) lanes dedicated to manually-speed controlled lanes, which would have lower conventional speed limits.
Then you can do neat things like cars announcing intentions to the whole traffic system. Think what a traffic system could do if it knew the intended routes of a majority of the vehicles in transit, especially incorporating data like the locations of any road hazards and moving emergency vehicles.
You can also (more) safely set lane limits at higher speeds than might be wise with all the cars having manual speed controls, thus solving the safety issue as well as the desire to let people move freely at maximum safe speed.