The goal is to reduce instantaneous speed, not throughput (or even necessarily total travel time). Because people don’t obey speed limits, the roads must be ph

The goal is to reduce instantaneous speed, not throughput (or even necessarily total travel time). Because people don’t obey speed limits, the roads must be physically redesigned. See https://en.wikipedia.org/wiki/Traffic_calming https://en.wikipedia.org/wiki/Traffic_calming Urban streets should be limited to 15–20 miles/hour. Any faster and cars are grossly unsafe for everyone else on the road. On my street the average speed is something like 40 mph (despite a speed limit of 25 mph), and some cars drive 55 mph. At that speed cars can’t react in time to avoid obstacles in the road, and if a pedestrian (e.g. young kid) or cyclist gets hit by a car, they are almost certain to die. And yet this is perceived by Americans as perfectly normal and acceptable.