The Environmental Protection Agency plans to relax rules aimed at reducing auto tailpipe emissions.

Federal safety regulators have asked Elon Musk's car company to explain how its driverless taxis will avoid causing accidents when they hit the road in Texas next month before a national “robotaxi” launch that is key to keeping Tesla's stock price aloft.

The Justice Department is suing four states over climate action.

The head of the Environmental Protection Agency has privately urged the Trump administration to reconsider a scientific finding that's long been the central basis for U.S. action against climate change.

In the past 15 months, no one has been more responsible for safety on the nation’s roads than Ann Carlson.

The U.S. government wants to raise the fuel economy of new vehicles 18% by the 2032 model year so the fleet would average about 43.5 miles per gallon in real-world driving.

The U.S. government’s auto safety agency plans to require that all new passenger cars and light trucks include potentially life-saving automatic emergency braking and meet stricter safety standards within three years.

The number of traffic deaths on U.S. roadways fell slightly during the first nine months of 2022, but pedestrian and cyclist deaths continued to rise.

The number of people killed on U.S. roadways fell slightly from April through June.