PHOENIX - A self-driving vehicle operated by Waymo was involved in a crash Saturday night in Mesa, Arizona, officials said.
The five-car collision happened about 10 p.m. Saturday.
The self-driving van was not in autonomous mode at the time of the crash, said a spokesperson for the Mesa Fire and Medical Department.
Fire officials said four people were not injured, while another four refused treatment. One child was taken to the hospital with minor injuries.
A vehicle failed to stop for a red light, according to fire officials. The car then collided with the Waymo vehicle. The first car continued driving and collided with three more vehicles before coming to a stop.
Police believe the driver, who was arrested, was impaired at the time of the crash.
Waymo vehicles have become more prevalent throughout the Phoenix area and the southeast Valley since parent company Google brought the self-driving-car project to Chandler, Arizona.
"Our team's mission is to make our roads safer - it is at the core of everything we do and motivates every member of our team. We are concerned about the well-being and safety of our test driver and wish her a full recovery," the company said in a statement.
Waymo vehicles have been involved in a number of crashes since the project launched. Police have determined they were all human-caused.
This is the second crash involving a Waymo vehicle in the last two months. In May, a driver was cited for running a red light after striking a self-driving vehicle in Chandler. The self-driving van, which was in autonomous mode with a person behind the wheel, was not at fault, police said.
Self-driving vehicles recently came under fire when an Uber vehicle in autonomous mode with an operator behind the wheel hit and killed a 49-year-old woman in Tempe in March.
The National Transportation Safety Board determined the car did not brake or alert the driver despite detecting the pedestrian six seconds before the crash. Both Uber's emergency braking and the factory-installed emergency-braking system on the Volvo XC90 were disabled, in part to reduce the jerkiness of the ride, according to the NTSB.
Uber announced in May that the company had stopped testing autonomous vehicles in Arizona.
Contributing: Ryan Randazzo, The Arizona Republic. Follow Bree Burkitt on Twitter: @breeburkitt
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