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Sensors are seen mounted to a self-driving Audi during a
Sensors are seen mounted to a self-driving Audi during a self-racing cars event in Willows, California, U.S., April 1, 2017. REUTERS/Stephen Lam
Sensors are seen mounted to a self-driving Audi during a self-racing cars event in Willows, California, U.S., April 1, 2017. REUTERS/Stephen Lam