From What Are the Nation’s Top Cities and Regions for Driverless Tech?:

Silicon Valley and the Bay Area
Silicon Valley and the Bay Area

Strengths: Center of the U.S. tech industry, thought leadership, tons of investment capital, talent.
Key players: Waymo, Apple, Tesla, Intel, Uber, Lyft, Cruise, Zoox.
X Factor: Can tech companies get driverless cars on the road without the auto industry?