(Yicai Global) Feb. 28 -- Four Chinese autonomous driving firms, Baidu, Auto X, Pony.AI and Didi, have ranked in the California Department of Motor Vehicle's list of the 10 companies whose vehicles need human intervention less frequently.

Baidu's four self-driving cars in the state topped the leaderboard after driving 108,300 miles last year and requiring the Apollo autonomous driving platform to disengage, meaning it required human intervention, just six times, the department said. Auto X and Pony.AI came in fourth and fifth, while Didi ranked eighth after submitting its test report for the first time.

Other firms in the top 10 were last year's leader Waymo, GM's Cruise, Nuro, ZoX, Plus AI and AiMotive. Uber, Apple and Tesla all failed to make the cut.

Sixty of 64 companies with autonomous vehicle testing licenses traveled a total 2.88 million miles in autopilot on Californian roads last year, up from 800,000 in 2018.

Editor: James Boynton