Waymo will start testing its robo-taxis on Phoenix freeways, adding to the company’s already large reach in Arizona while California lawmakers and labor organizations demand new regulations for self-driving vehicles. 

Expanding driverless rides to freeways comes after years of testing on California and Arizona public roads, according to an announcement Waymo made Monday. Autonomous rides on the freeway will be available to company employees only as part of the initial testing process.