Uber is coming back to autonomous vehicle testing eight months after one of its test vehicles hit and killed a pedestrian crossing the street in Arizona. The plan this time around is to be overly cautious. Vehicles will run on a one-mile loop between two company offices in Pittsburgh — they will only be allowed to operate in the daylight and in dry weather conditions. Speed will also be limited to 25 mph for every vehicle testing. There won’t be any rides given to passengers in these test vehicles..