Amazon 's Zoox is making its toaster-shaped self-driving vehicles available through the Uber app in Las Vegas starting this summer, the latest sign of momentum in the nascent but fast-growing robotaxi market. As part of a multiyear partnership announced Wednesday, the companies said they plan to make Zoox rides available in Los Angeles next year. In both cities, Zoox will continue to offer rides on its own app as well. Amazon, which acquired Zoox in 2020, is way behind Alphabet's Waymo, the U.S.