https://www.theverge.com/2018/3/2/17071284/arizona-self-driving-car-governor-executive-order

Arizona governor Doug Ducey issued a new executive order on Thursday that makes official what many already assumed: fully driverless cars without anyone behind the wheel are allowed to operate on public roads. The only caveat is that the vehicles follow all existing traffic laws and rules for cars and drivers.

“As technology advances, our policies and priorities must adapt to remain competitive in today’s economy,” Ducey said in a statement. “This executive order embraces new technologies by creating an environment that supports autonomous vehicle innovation and maintains a focus on public safety.”