In this file photo, an Uber driverless car heads out for a test drive in San Francisco. Uber's self-driving cars are coming back to California, though the company doesn't plan to pick up passengers for now. The California Department of Motor Vehicles said Wednesday, March 8, 2017, it has granted the ride-hailing company permission to run two Volvo SUVs on public roads. (AP Photo/Eric Risberg, File)
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