Dr. Steven Scott Cliff, nominee to be administrator of the National Highway Traffic Safety Administration, testifies during a Senate Commerce, Science and Transportation Committee confirmation hearing in Russell Building on Thursday, December 16, 2021.Dr. Steven Scott Cliff, nominee to be administrator of the National Highway Traffic Safety Administration, testifies during a Senate Commerce, Science and Transportation Committee confirmation hearing in Russell Building on Thursday, December 16, 2021.

Steven Cliff, the head of the National Highway Traffic Safety Administration, will leave the agency in September, according to the Department of Transportation.

Pete Buttigieg told CNBC in a statement that Ann Carlson, the chief counsel of NHTSA, would take over.

The California Air Resources Board is a climate agency that is focused on reducing air pollution. The previous CEO, Richard Corey, retired at the end of June, and CARB announced on Friday that it had found a new leader.

New vehicle safety rules that are intended to increase safety for drivers, cyclists and pedestrians were worked on by Cliff during his time with NHTSA. Concerns about the safety of electric vehicle batteries and software that controls cars are some of the issues the agency is dealing with.

NHTSA has been called on to stop the testing of unfinished driver assistance software by automotive safety activists due to how frequently it malfunction.

The agency issued a "standing general order" that requires automakers to give NHTSA data on fatal and other significant crashes that involved their cars and advanced driver assistance systems.

There are a number of ADAS options in consumer cars. Cars aren't safe for use without a human behind the wheel. There are automated driving systems in the works.

President Joe Biden nominatedCliff to lead the NHTSA after he served as deputy administrator.

Secretary Buttigieg thanks Cliff for his service at the agency and his work to protect the lives of the American people.

NHTSA didn't give any further details about the circumstances ofCliff's departure

There is a video of the transportation secretary. Pete Buttigieg would like to see gas prices fall further.