The Trump administration has finally come out with its proposal to reverse Obama-era regulations on vehicle emissions. This is welcome, for current standards make cars unnecessarily expensive and limit choices while producing scant environmental benefit.

The Environmental Protection Agency and the National Highway Traffic Safety Administration, which jointly administer the CAFE (corporate average fuel economy) program, unveiled eight options for fuel-economy standards for vehicles made between 2021 and 2026. Of those, the agencies recommend freezing standards at 2020 levels through 2026 as the best option.