Google is preparing to expand a San Francisco carpooling program in a move that could that could set up a showdown with its one-time ally, the popular ride-hailing service Uber.
The plans will build upon a test service that Google's navigation app Waze launched three months ago in the San Francisco Bay Area.
The program allows anyone using the Waze app to offer a ride to a limited pool of people trying to get to work or home.
Now, only people working at six companies, including Google, Wal-Mart Stores and Adobe Systems, can request rides. The tests have worked well enough to encourage Waze to move into the next phase and allow anyone in the Bay Area with its app to...