I think hexagonal cities are going to require different traffic patterns. I think it would make the most sense to have cars drive in "circles" around the hexago

I think hexagonal cities are going to require different traffic patterns. I think it would make the most sense to have cars drive in "circles" around the hexagons, and then having the left (outermost) lane available for left turning onto another hexagon. That way, it's really easy to do U-turns (just drive, uninhibited, around the hexagon) and you could build highways at varying distances that act as loops (like major metro areas already have). This sounds like an interesting problem to model computationally! I wonder what the optimal hexagon:car size ratio is? (essentially how many times longer should the side of a block be than a car) Granted, I think that it's going to become necessary at some point to have cars and pedestrians operating on different "floors" - in major metro areas, pedestrians are already massive cluster fuckers and getting around downtown SF or NY is incredibly inefficient in an automobile (at least during the day).