Some drivers say vehicles using new version of full self-driving system can travel above speed limits

The US main transportation safety regulator said on Friday it is seeking information from Tesla about a new driver assistance mode dubbed “Mad Max” that operates at higher speeds than other versions.

Some drivers on social media report that Tesla vehicles using the more aggressive version of its full self-driving (FSD) system could operate above posted speed limits.

“NHTSA is in contact with the manufacturer to gather additional information,” the National Highway Traffic Safety Administration (NHTSA) said in a statement. “The human behind the wheel is fully responsible for driving the vehicle and complying with all traffic safety laws.”

NHTSA earlier this month opened an investigation into 2.9m Tesla vehicles equipped with its full self-driving system due to the dozens of reports of traffic-safety violations and crashes.