Running self-driving car experiments in Phoenix, Arizona and Pittsburgh. It pulled out of San Francisco last year after the state said Uber didn’t have proper test permits. But this month, it said issues were resolved and it would return to California to continue autonomous vehicle tests. In February, it partnered with Daimler to work on self-driving cars. Uber also acquired Otto, the self-driving truck company, last year. An Ottoequipped tractor-trailer drove on Colorado’s Interstate 25 in October to deliver beer to Colorado Springs.