Food delivery service DoorDash announced it is teaming up with General Motors to test using self-driving cars to deliver meals and groceries in San Francisco. A pilot program with the US automaker's Cruise Automation division will start in March, according to the San Francisco-based startup launched in 2013 by Stanford University students.

Uber said it was taking the first step toward restarting its autonomous ridesharing program, putting its self-driving cars back on the road in "manual mode" with a driver at the wheel at all times.