Ducey spokeswoman Elizabeth Berry declined to provide details on Uber's departure or say whether the Governor's laissez-faire approach to regulation of the driverless industry had been a mistake.
"The Governor's focus has always been on what's best for Arizonans and for public safety, not for any one company," Berry said in a statement, adding that the suspension of Uber's driverless testing "remains in place pending the outcome of federal investigations."
In a statement, Uber said it is "committed to self-driving technology" and is seeking to return its driverless fleet to the road "in the near future."
"In the meantime, we remain focused on our top-to-bottom safety review, having brought on former NTSB Chair Christopher Hart to advise us on our overall safety culture," the company said.
Uber is working with local and state officials in Pennsylvania in the hope of re-starting on-road testing in Pittsburgh this northern summer.
The company will concentrate its real-world testing in places where Uber has engineers on hand to make improvements, rather than working from afar, as was the case in Arizona.
The employees in Arizona were mostly backup drivers, with some schedulers and other operations personnel, but not engineers. Uber's main driverless research group is based in Pittsburgh.
The company also is talking with state officials in California, as well as the cities of San Francisco and Sacramento, about future driverless testing.
Uber will offer job coaching and other services in the coming weeks for the Arizona workers being laid off. Its ride-sharing and food delivery businesses will continue in the state.