^Have you ever been downtown in rush hour? First, you can't make all pedestrian crossings bridges. You may as well bury the whole road network at that point. Second, it's already mostly stopped traffic, self driving cars aren't going to be able to maneuver any faster. Adding more vehicles circling the block waiting for their "passenger" is going to make it worse.
It will be interesting to see how we prevent pedestrians from just crossing wherever they want once we have self driving cars that are programmed not to hit anyone.
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