Together the companies plan to open a network of U.S. hubs where Lyft drivers can rent GM vehicles at discounted rates. That could expand Lyft’s business by giving people who don’t own cars a way to drive and earn money through Lyft. It also gives GM a leg up on such competitors as Daimler AG and Ford Motor Co., which are developing their own ride-sharing services. And it would put more young drivers behind the wheel of a Chevrolet, Buick, GMC, or Cadillac. Longer term, GM and Lyft will work together to develop a fleet of autonomous vehicles that city dwellers could summon using Lyft’s mobile app. Partnering with GM could give Lyft a boost over its archival, Uber Technologies Inc., which is working on its own driver less cars.