Self-driving startups race down a narrowing road

Self-driving startups race down a narrowing road

Sensors are seen mounted on the windshield of a self-driving car during a self-racing cars event in Willows, California, U.S., April 1, 2017. REUTERS/Stephen Lam

Lei Xu and Justin Song once worked at electric carmaker Tesla Inc, one of the hottest companies in Silicon Valley. But with interest and investments in autonomous vehicles mounting, they left to pursue what they see as the next big thing.

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