Philadelphia is one of more than 10 cities where human autonomous-technology experts will be taking Waymos on summer “road trips,” allowing the cars “to get to know the city,” spokesperson Sandy Karp said in a statement. The testing fleets are closed to the public.

And on Monday, Waymo said that its vehicles arrived on the streets of New York City, where the company will begin by manually collecting driving data. It's also rolling out a limited fleet of vehicles with human drivers in Philadelphia.