Tesla Inc. made a modest but pivotal move in its bid to dominate the autonomous vehicle industry by launching its robotaxi service in Austin, Texas on Sunday.

The pilot program, involving up to 20 Tesla Model Y electric vehicles, marks the automaker’s first public deployment of its fully driverless ride-hailing service—a concept long touted by Chief Executive Elon Musk as the company’s next transformative frontier.

There are no human drivers in these vehicles. Instead, they are steered by Tesla’s Full Self-Driving (FSD) software, the company’s most advanced iteration of its driver-assistance technology.

The ride cost? A flat fee of $4.20, according to a post by Musk on X.