Uber halts California self-driving cars test Published duration 22 December 2016

image copyright Volvo image caption Uber had started to pick up passengers in specially-modified Volvo self-driving cars

Ride-sharing firm Uber has suspended its test of self-driving cars in San Francisco after regulators revoked the registration of the vehicles.

But authorities had threatened legal action if Uber did not obtain a special permit to test the cars.

Uber argues that because they came with a safety driver and are not fully autonomous, the permit was not needed.

"We're now looking at where we can redeploy these cars, but remain 100% committed to California and will be redoubling our efforts to develop workable statewide rules," Uber said.

San Francisco is Uber's second trial city for the new technology. In Pittsburgh, the company has been running its driverless trial since September and has not required special permits.

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Not yet fully autonomous

Although the cars are promoted as "self-driving", they must constantly be monitored by an actual driver who can take control any time the software should fail.

Uber says its technology is not sophisticated enough to have cars continuously drive by themselves - and therefore the permit demanded in San Francisco is not needed.

image copyright Uber image caption Uber began using Ford cars to test its self-driving technologies in Pittsburgh earlier this year

But regulators say that 20 other companies testing self-driving technology in California - including Google, Tesla and Ford - do so with the special permit which requires the firms to report any accidents to the authorities. This potentially undermines the company's reputation, as the reports are available to the public.

Just before the city's Department of Motor Vehicles threatened Uber with legal action over the missing permit, a video of an Uber self-driving vehicle running a red light in San Francisco had been uploaded to YouTube.

The trials are designed for the firm to identify flaws and glitches in the technology behind the autonomous driving.