Autonomous delivery bots have hit the streets in Washington, D.C., and Redwood City, California, the first two U.S. cities to give the thumbs up to a test run by robotics startup Starship Technologies. According to Recode, the robots started making food deliveries on behalf of Postmates and DoorDash beginning Wednesday. The robots cruise the sidewalk at 4 mph and navigate using nine cameras, GPS, and artificial intelligence software. They are designed to constantly relay information about their route to the entire fleet, allowing them to travel more efficiently over time. According to the company, the bots can traverse curbs and small rocks, and they're smart enough to avoid people and animals.