content: First of all, your single occupancy vehicle today is a 5 seater. The 1 person cars could be much smaller, a single seat with a small storage space for a backpack, briefcase, or a few grocery bags. This could be half the width of today's sedan. That would allow much better range on smaller battery packs and also allow higher traffic density, more smaller cars on the road.  The driverless cars can also be better connected to utilize alternate routing. If the highway is full, use the side streets. They will also likely be able to drive much faster and tighter than people can without incident. If the highway is bumper to bumper, but zooming at 50-60 MPH in the autocar lanes, kinda like HOV lanes, but steering wheels prohibited, you can have plenty of traffic without the jam.