Waymo, the self-driving robotaxi service, announced on Monday that it would be starting “roadtrip testing” in Philadelphia this summer.

State of play: Waymo began deploying a fleet of cars with a human driver in Philly this week. Yes, but: You can't hail one. The fleet is closed to the public as the company develops its autonomous driving technology and familiarizes itself with the city.

Driverless rideshare service Waymo, owned by Google parent Alphabet, deployed its fleet to New York City this week to begin mapping out the city roads – with humans still sitting behind the wheel while they await a change in state law to allow fully driverless riding.