San Francsico Mayor Wants a Safety Test for Self-Driving Cars

For many cities, here's the toughest pill to swallow: Their mayors don't actually have control of their streets. This is true of the metro Phoenix area, where Google's self-driving sister company Waymo is testing cars without drivers inside. And Miami, where Ford will touch down with self-driving pizza delivery vehicles this month. And Boston, where cars powered by the developer NuTonomy are picking people up near the seaport.