General Motors (GM.N) announced that it will end robotaxi development at its majority-owned, money-losing Cruise business, a blow to the ambitions of the largest US automaker which had made the advanced technology unit a top priority.

The Detroit-based car company said it would no longer fund work on self-driving robotaxis “given the considerable time and resources that would be needed to scale the business, along with an increasingly competitive robotaxi market.”

The automaker has invested more than $10 billion in Cruise since 2016. Cruise will be folded into its group working on driver assistance technology.

The move comes on the heels of GM scaling back plans for electric vehicles, selling its stake in one of its joint venture battery plants and restructuring its China business, leaving the company more focused on its profitable business of making gasoline-powered pickup trucks and other large vehicles.

GM shares rose 3.2 per cent in extended trading on Tuesday.

In 2023, GM CEO Mary Barra said the Cruise business could generate $50 billion in annual revenue by 2030 but on Tuesday said the business was expendable.

“You’ve got to really understand the cost of running a robotaxi fleet, which is fairly significant, and again, not our core business,” Barra said on an analyst call.

GM expects the restructuring will cut spending from about $2 billion to $1 billion after the plan is completed by the end of June.