the energy cost of a car coming to a full stop is very large though. if you're going to have cars in the city at all, you should have a system of one-way street

the energy cost of a car coming to a full stop is very large though. if you're going to have cars in the city at all, you should have a system of one-way streets with synchronized lights so vehicles rarely come to a full stop. letting pedestrians interrupt this whenever they feel like crossing is not only annoying, but leads to much higher gas consumption.