Driverless cars should be a huge boon to the efficiency of moving cars along existing roads. There may be an awkward period during which both automated and hum

Driverless cars should be a huge boon to the efficiency of moving cars along existing roads. There may be an awkward period during which both automated and human-driven cars are on the road at the same time, but by the time it's mostly robots out there, traffic will flow much better. Traffic congestion is caused mostly by human-led factors like route choice and poor cooperation (in merging, etc.) rather than merely the number of cars on the road.