A lot of fuel is spent on accelerating the vehicle, much more than to sustain the speed. That is why you spend more gas driving in the city with jams and traffi

A lot of fuel is spent on accelerating the vehicle, much more than to sustain the speed. That is why you spend more gas driving in the city with jams and traffic lights. If every car was driven by a computer, they could in theory form a network and do for example, the perfect meshing on the intersections without stopping, only accelerating or deccelerating a little. Computers could also drive big traffic slowly but steadily without lots of starts and stops.