<ul data-eligibleForWebStory="true">Tesla launched its robotaxi service in Austin, Texas, with about 10 vehicles and a human safety driver on board.The launch was low-key and only open to select social media influencers.Customers will pay a $4.20 flat fee to use the service.The vehicles will operate in limited areas, avoid challenging intersections, and have teleoperators available.Elon Musk has stepped back from his US government role to focus on Tesla and the robotaxi service.Regulatory scrutiny continues on Tesla's autopilot and self-driving systems.The National Highway Traffic Safety Administration is investigating Tesla's claims about its autonomous technology.Tesla's robotaxis rely on cameras, unlike competitors such as Waymo that use radar and lidar sensors.A group of Democratic lawmakers in Texas urged Tesla to delay the launch until a new autonomous vehicle law is implemented in September.Analysts warn that catching up to or surpassing Waymo will be a significant challenge for Tesla.Tesla has opened a website for the public to sign up for robotaxi updates.The Cybercab robotaxi, unveiled last year, is expected to sell for less than $30,000.Tesla has been cautious about safety but aims to expand the service rapidly.Waymo remains the only company with a fully public self-driving ride-hailing service in the US.Rivals like Waymo and Zoox use remote monitoring systems without safety drivers in the vehicles.There are concerns about the accuracy and reliability of Tesla's autonomous system.There is uncertainty regarding how quickly Tesla can expand its service and scale up against competitors.