The US Auto Safety Board decided to open an investigation into Tesla’s CyberCab self-driving taxi, raising questions about how the company concluded that a car without a steering wheel, pedals or mirrors meets federal safety standards.

The National Highway Traffic Safety Administration recently announced that it will study the procedures and technical data that Tesla relied on when approving the standards for this two-seat car.

This announcement came hours after Tesla began commercially deploying CyberCab cars in Austin, Texas, following the car’s launch ceremony.

Tesla praised what it described as the easy and safe use of the vehicle by people with special needs, considering that the “CyberCab” provides everyone with clean, non-polluting means of transportation.

In the United States, automakers themselves certify their vehicles to meet federal standards.

Tesla has informed the National Traffic Safety Administration that it has certified the CyberCab as meeting all applicable standards, and that it plans to expand the scope of deployment of this vehicle to include more locations.

The National Administration announced that it will evaluate the extent to which this approval is based on Tesla’s own assessments that certain standards do not need to be applied to a car that lacks permanently installed manual controls.