Without stoplights, self-driving cars will be able to harmoniously merge, turn, and navigate the road without causing traffic congestion. And no congestion means greatly reducing emissions that otherwise accumulate at intersections, all while increasing the number of cars that can pass through without being delayed. There’s a problem with DriveWAVE’s model, however. As The Atlantic’s City Lab points out, the simulation doesn’t take into account foot or bicycle traffic. It’s enought to leave you wondering how autonomous vehicles will accommodate the enduring reality that is people moving around cities in things that aren’t cars.