Maybe TomMarius means that autonomous vehicles could negotiate intersections without stopping. No traffic lights required, only rules of precedence. It's going to be a slow procession but maybe the average speed would increase.

I'm not sure how that would mix with pedestrian crossings. In some dense areas there would be a non stop flow of people walking across the street and cars wouldn't be able to move.

The cars can work together to reduce riding distances, move faster in tandem when going in a green light, and so on. They virtually make the road much wider by eliminating human inefficiency in driving.

Actually they do. There are streets full of parking empty cars, moving cars are at best a half.

Plus reduction of number of driving cars to roughly one third.