A newest list posted on DMV's website showed 53 pieces of Autonomous Vehicle Testing Permits (with a driver) had been permitted as of last Thursday, Xinhua reported on Monday.
Didi was the latest one joining the group, which includes both technology and automotive companies.
Didi Senior Communications Director Liang Sun was quoted by The Wall Street Journal Monday as saying that the company had been testing autonomous vehicles in closed internal environment for a while and it is finalising its plans to begin US road trials which will be made in a "prudent and safety-first" manner.
Didi last year opened its main research facility in Mountain View of California, 860 kilometres north of Los Angeles, to focus on developing artificial intelligence, including autonomous driving.
The approval from the California state regulator is Didi's first license for testing on public roads in the US.
Besides Didi, many Chinese companies including Baidu, Faraday & Future, Changan Automobile, have started its test in the state.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)