There are more than 100 Waymo vehicles in the city, with plans for further expansion.  Earlier this month, Waymo's vehicles also arrived on the streets of New York City, where the company will begin by manually collecting driving data.

Alphabet's Waymo is expanding its service in Austin, Texas, to 90 square miles from 37 square miles earlier, the software giant's self-driving unit said on Thursday, seeking to protect its top position in the city from rivals such as Tesla.

Waymo is more than doubling its service territory in Austin as the driverless taxi firm looks to fend off competition from Tesla Inc.