Waymo will begin dispatching its robotaxis in four more cities in Texas and Florida, expanding the territory covered by its fleet of self-driving cars to 10 major U.S. metropolitan markets.

The move into Dallas, Houston, San Antonio, and Orlando, Florida, announced Tuesday, widens Waymo’s early lead in autonomous driving while rival services from Tesla and the Amazon-owned Zoox are still testing their vehicles in only a few U.S. cities.

In contrast, Waymo’s robotaxis already provide more than 400,000 weekly trips in the six metropolitan areas where they have been transporting passengers: Phoenix, the San Francisco Bay Area, Los Angeles, Miami, Atlanta, and Austin, Texas.

Waymo operates its ride-hailing service through its own app in all the U.S. cities except Atlanta and Austin, where its robotaxis can only be summoned through Uber’s ride-hailing service.

The expansion into four additional markets marks a significant step toward Waymo’s goal to surpass 1 million weekly paid trips by the end of 2026.

Without identifying where its robotaxis will be available next, Waymo is targeting eight other cities, including Las Vegas, Washington, Detroit, and Boston, while signaling that its first overseas availability is likely to be in London.

To help cover the cost of more robotaxis, Waymo recently raised $16 billion as part of a financial infusion that puts the company’s value at $126 billion.

The valuation fueled speculation that Waymo may eventually be spun off from its corporate parent Alphabet, where it began as a secret project within Google in 2009.

Although Waymo is expanding to four more cities, its robotaxis will initially be available only to a limited number of people through its ride-hailing app in Dallas, Houston, San Antonio, and Orlando, before the service is available to all comers in those markets.