A logo of the autonomous driving technology startup Pony.ai is seen on a screen during an event in Beijing, China May 13, 2021.Tingshu Wang | ReutersChina's Silicon Valley, Shenzhen, is about to allow self-driving taxis to operate throughout the city, ending years of pilot zones and tight limits.Pony.ai announced Friday it was the first company to receive a robotaxi permit for the entire city, though the coverage area will be rolled out in phases.The news marks a milestone for China's push to in...