The closure comes after an autonomous Uber vehicle struck and killed a pedestrian in Tempe in March, and stems from an internal safety assessment the company took on following the incident.

Survey suggests motorists in self-driving cars could be driven to distraction

Google says three of its self-driving vehicles were involved in crashes in the Phoenix metro area in August.

If you live in northern California, seeing a car driving itself down the highway might not surprise you. They may soon be seen on Arizona roads.