The Rivian robotaxis would be available exclusively through Uber's ride-hailing app. Above, Rivian chargers in Charlotte, N.C., in 2024. (Chris Carlson / Associated Press) Uber is expanding its role in the robotaxi industry through a new partnership with Rivian, the Irvine-based electric-vehicle maker. Uber and Rivian announced a partnership Thursday that could bring up to 50,000 self-driving R2 vehicles to cities across the U.S., Canada and Europe by 2031. The Rivian robotaxis would be available exclus ...