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March 26, 2018 11:00 PM, EDT

Arizona Suspends Uber’s Autonomous Vehicle Testing

An autonomous Volvo used by Uber An example of an autonomous Volvo being tested by Uber. (Gene J. Puskar/Associated Press)

Arizona ordered Uber Technologies Inc. to stop operating autonomous vehicles on the state’s roads indefinitely after the death of a pedestrian there a week ago.

In a letter to Uber Chief Executive Officer Dara Khosrowshahi, Gov. Doug Ducey called the March 18 fatal incident involving an Uber self-driving car “an unquestionable failure” to comply with public safety standards.

Arizona Governor's Letter to Uber by Transport Topics on Scribd

Uber had voluntarily halted testing companywide after one of its vehicles hit and killed a woman in Tempe, Ariz. Ducey’s decision March 26 to designate a ban adds a significant hurdle to Uber’s attempts to get the program back on track.

“Improving public safety has always been the emphasis of Arizona’s approach to autonomous vehicle testing, and my expectation is that public safety is also the top priority for all who operate this technology in the state,” Ducey wrote in the letter. “Arizona will not tolerate any less than an unequivocal commitment to public safety.”

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Uber has previously tested autonomous vehicles in California and Pennsylvania, in addition to Arizona. The company hasn’t said when it will start operating them on public roads again. “We continue to help investigators in any way we can, and we’ll keep a dialogue open with the governor’s office going forward,” Matt Kallman, a spokesman for Uber, wrote in a statement.

Arizona is one of the friendliest U.S. states to auto and technology businesses looking for someplace to give driverless cars experience on public roads. A couple weeks before Uber’s fatal encounter, Ducey approved the use of autonomous vehicles without safety drivers — although the Uber car involved in the incident had a person at the wheel.

Last week, Massachusetts quietly asked companies testing in the state to take a few days off the road. Most companies continued driving elsewhere.

A video released by Tempe police showed the Uber car moving at a constant speed with no attempt to slow down or swerve in the moments before the collision. In recent days, executives from Alphabet Inc.’s Waymo and Intel Corp.’s Mobileye said their driverless-car software would have detected and responded to Elaine Herzberg, the woman struck while walking her bicycle across the road.