Four crashes that occurred while Tesla's self-named Actually Smart Summon feature prompted the NHTSA's safety investigation.

The National Highway Traffic Safety Administration announced it is investigating nearly 2.6 million Tesla vehicles over a remote driving feature.

The U.S. National Highway Traffic Safety Administration said on Tuesday it had opened a probe into about 2.6 million Tesla vehicles after reports of some crashes linked to its "Actually Smart Summon" driverless feature.