I really feel that this is the future once GPS and on-board driving AI improves. We could repurpose or expand sections of interstate to include two lanes of computer-controlled driving. It could work like the toll system or HOV lanes, where when your car enters a specific area the computer automatically takes over and drives for you. Road-trains would result and all the benefits that come with it. We would still have regular traffic on surface/residential roads and interstate exits and could drastically reduce traffic on non-computer-controlled interstate. I would gladly sign up to kick back and relax on long stretches of highway.