Tesla stock rose early Thursday as CEO Elon Musk revealed development plans for his company’s self-driving taxi service.

Tesla has told California Department of Motor Vehicles officials that it plans to take a phased approach to operating in the state, starting with giving employees pre-arranged rides using a safety

Tesla's Robotaxi service launched last month in a geofenced area in South Austin, with a reported 10-20 Model Y cars, and it was only open to a small number of people. Musk didn't say whether the expansion also means introducing more cars to the mix.