Uber plans to resume testing its self-driving cars in Pittsburgh this summer.

The company is shutting down testing operations in Arizona and focusing instead on testing in Pittsburgh and San Francisco, according to an internal email from Eric Meyhofer, a Carnegie Mellon University graduate and the head of Uber’s self-driving car operations.

Meyhofer wrote that Uber wants to resume testing in Pittsburgh first and hopes to restart testing in San Francisco and Sacramento, Calif.

“Our return to public roads is tied to securing the proper testing permits alongside our safety improvements,” Meyhofer wrote. “We remain focused on our safety review, which is evaluating everything from the safety of our system to our vehicle operator training.”
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