Banning cars from city centers is the only way to cut traffic deaths and pollution, but I wonder if we've thought through the consequences for people who actually depend on them. I live in a mid-sized city where buses run every 20 minutes during the day but stop at 9 PM, and my night-shift neighbors would be stranded. Do we really believe we can redesign whole neighborhoods overnight, or are we just pushing the problem to the outskirts?