Dec. 21 (UPI) -- Uber has returned its self-driving vehicles to U.S. roads for further development, after a nine-month suspension brought on by a deadly crash during a test in Arizona.
The ride-hailing company said Thursday it will start with "a couple" autonomous vehicles in Pittsburgh, before expanding its fleet.
"Today we are resuming on-road testing of self-driving operations in Pittsburgh," Eric Meyhofer, head of Uber Advanced Technologies Group, said in a blog post. "This follows the Pennsylvania Department of Transportation's approval and months of vehicle testing on our track and manual driving on Pittsburgh streets."
Uber suspended testing of the self-driving vehicles in May after one killed a pedestrian on a bicycle near Phoenix. A safety driver who monitors the auto controls was behind the wheel, but wasn't paying attention when the Volvo sport-utility vehicle ran into the woman.
Uber was forced to pull their autonomous SUVs from Arizona roads when the state revoked its permit to perform the tests.
The ride-sharing company also said Thursday it's driving special vehicles in San Francisco to gather data for autonomous development. It's not testing self-driving vehicles anywhere in California, though, because it doesn't have a permit. Similar testing is being done in Toronto.
Pittsburgh Mayor Bill Peduto said he has an "open dialogue" with Uber to make sure the returning vehicles are safe.
"Before any vehicles are on public roads, they must pass a series of more than 70 scenarios without safety-related failures on our test track," Meyhofer said. "We are confident we've met that bar as we reintroduce self-driving vehicles to Pittsburgh roadways.
"We will continue to prioritize safety and proactively communicate our progress until we've built a self-driving system that lives up to the promise of making transportation safer and more affordable for everyone."
Other companies are also testing self-driving vehicles in Pennsylvania, including Aurora Innovation, Argo AI, Carnegie Mellon University and Qualcomm Technologies. Aptiv is seeking authorization from the Pennsylvania Department of Transportation.