You don't even need rails for traffic to improve. Just think at what happens when a traffic light goes green: human drivers slowly, one-by-one, cross the inters

You don't even need rails for traffic to improve. Just think at what happens when a traffic light goes green: human drivers slowly, one-by-one, cross the intersection. Whereas a platoon of self-driving cars can, in principle, just accelerate (or brake) simultaneously. On highways this also improves drag/energy efficiency and has already been tested in Europe as part of EU Truck Platooning Challenge.