Waymo, the self-driving car company has expanded its driverless ride-hailing service to include 27 square miles of California’s famed Silicon Valley.

Waymo will start offering robotaxi rides to people in its “Waymo One” early rider program in Mountain View, Los Altos, Palo Alto, and “parts of Sunnyvale” starting Wednesday, an expansion that will bring its footprint in Silicon Valley to 27 square miles.