FILE - In this Tuesday, Dec. 13, 2016, file photo, Devin Greene sits in the front seat of an Uber driverless car during a test drive in San Francisco. Uber has pulled its self-driving cars from California roads. The ride-sharing company said Wednesday, Dec. 21, 2016, California transportation regulators revoke registrations for the vehicles. The DMV confirmed that it had moved to revoke the registrations of 16 cars, saying officials had been determined that the registrations were improperly issued because the vehicles were not properly marked as test vehicles. (AP Photo/Eric Risberg, File)
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