Why do we keep designing streets for speed?
Japan runs with somewhat lower speed limits.<p>The article is heavy on Celebration, FL, which was built by Disney, but has fallen on hard times.  It&#x27;s deliberately retro idealized 1950s America, and entirely privatized. That&#x27;s a very unusual community.<p>The optimal speed for maximum traffic flow is around 35mph.  Faster than that, and the cars space out further and throughput decreases. Slower than that, and not enough cars per second are passing. Metering signals are designed to throttle entry to the freeway to keep speed around 35mph.