Now Uber, which first announced plans to apply for the permit last week, has brought its self-driving cars back to California and acquiesced to the state’s rules. California Department of Motor Vehicles spokeswoman Jessica Gonzalez confirmed that Uber was on Wednesday granted a permit to test two self-driving cars on public roads. Gonzalez also said artificial intelligence startup Plus Ai Inc received an autonomous vehicle testing permit on Wednesday. The niche is becoming increasingly crowded with both startups and auto manufacturers trying to develop autonomous technology that could one day replace traditional cars.