For one thing, autonomous cars can, theoretically, increase the practical carrying capacity of individual roadways, they can also better utilize the capacity of

For one thing, autonomous cars can, theoretically, increase the practical carrying capacity of individual roadways, they can also better utilize the capacity of road networks by routing vehicles to underutilized roads. This would mitigate the impact of traffic. For the same reasons they can increase practical carrying capacity, they can also increase practical fuel efficiency, because the vehicles can be kept moving at a near constant speed with minimal breaking.