If a city banned all manually driven cars and allowed only self driving cars, the number of car-related deaths would drop to almost nothing. Goods could also be transported more efficiently. The technology to achive this exists right now, L5 or not. The only thing stopping citites from doing this is the cost that inhabitants will have in connection with selling or switching our their car. And all the complaining. But lives would be saved, and the city would be safer and more efficient.