At a typical intersection that uses red lights to control traffic, vehicles traveling on one roadway have a green light and can travel through the intersection, often at full speed, while vehicles traveling on the intersecting roadway have a red light and must come to a full stop until the signal changes.
This is a good system for human-controlled vehicles, but I'm wondering if, in a world where all vehicles are automated, it might be possible to eliminate red lights completely and instead use precision timing to permit traffic from both roadways to pass through the intersection in roughly an A-B-A-B pattern. Kind of like how some marching bands can have two line of marchers pass through each other orthogonally.
What would be the limiting factors to such a system? Let's assume that we'd never want two vehicles to come any closer to each other orthogonally than they would driving parallel in adjacent lanes. At what kind of traffic density could traffic in both roadways go full-speed through the intersection?