The preliminary probe will cover 2.4 million Tesla vehicles, the National Highway Traffic Safety Administration said, accounting for a big share of the electric automaker's vehicles on U.S. roads.

In a final rule released Monday, the National Highway Traffic Safety Administration (NHTSA) finalized its rule that would require rear seats in trucks and cars to have enhanced warnings for drivers.

DETROIT — In the waning days of President Joe Biden's administration, the government's highway safety agency is proposing voluntary safety guidelines for self-driving vehicles.