HMM: Tesla’s Full Self-Driving software under investigation after railroad incidents.

The National Highway Traffic Safety Administration said Thursday that it would investigate how Tesla’s semi-autonomous driving software handles railroad crossings as part of a wide-ranging investigation of incidents where the agency said Tesla vehicles have violated traffic safety laws.

NHTSA said it was launching the investigation of Tesla’s Full Self-Driving software after receiving complaints from drivers, including reports of vehicles driving through red lights or on the wrong side of the road. The agency said the investigation relates to all Tesla vehicles equipped with FSD, or 2.9 million vehicles.

The agency said its investigation would look at the software’s performance at railroad crossings, which was the subject of an NBC News investigation published in September.

Tesla’s FSD supposedly has a better safety record now than human drivers, but just like humans, it isn’t without its little quirks.