Federal regulators have launched 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 investigation began a day after Tesla started offering rides in the taxis.

The taxis in question are two-seater cars without steering wheels, mirrors, or brake pedals, which are typically required of all vehicles. They are being deployed in a service called Cybercabs.

Further details about the investigation and the Cybercab service are available from the source. Tesla's stock price was affected, dropping more than 5% in early trading.