In areas of these cities you currently have a choice between human driven and self driven taxis:

  Atlanta, GA, Austin, TX, Beijing, Chongqing, Dallas, TX, Denver, CO, Dubai, Fort Worth, TX, Guangzhou, Houston, TX, Las Vegas, NV, Los Angeles, CA, Miami, FL, Nashville, TN, Orlando, FL, Phoenix, AZ, San Antonio, TX, San Diego, CA, San Francisco Bay Area, CA, Shanghai, Shenzhen, Tampa, FL, Wuhan, Abu Dhabi