Federal regulators have opened an investigation into Tesla's new taxis that lack steering wheels. The National Highway Traffic Safety Administration is looking into whether these vehicles comply with safety rules. The probe began a day after Tesla started offering rides in the vehicles.

The vehicles in question are two-seater cars without steering wheels, mirrors, or brake pedals. Tesla's head, Elon Musk, launched the service with an event.

Further details about the investigation and the vehicles are available from the source, including the impact on Tesla's stock price, which was down over 5% in early trading.