Long, bumpy road for self-drive cars

General Motors recalled and updated software in 80 Cruise self-driving vehicles in September after a crash in San Francisco. PHOTO: REUTERS
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Autonomous vehicle start-ups have raised tens of billions of dollars based on promises to develop truly self-driving cars, but industry executives and experts say remote human supervisors may be needed permanently to help robot drivers in trouble.

The central premise of autonomous vehicles (AVs) - that computers and artificial intelligence will dramatically reduce accidents caused by human error - has driven much of the research and investment.

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