https://www.cnbc.com/2018/05/14/didi-chuxing-gets-permission-to-test-self-driving-cars-in-california.html >Chinese ride-hailing firm Didi Chuxing has been given a permit to test self-driving cars in California. >The company is allowed to test autonomous vehicles in the state as of May 10, according to the California Department of Motor Vehicles' website.