President Donald Trump signed an executive order and a proclamation on Tuesday to​ ease auto tariffs, the latest abrupt shift in a rapidly changing tariff policy that has left businesses scrambling to keep up.

A slower phase-in for tariffs on auto parts will give manufacturers time to ramp up manufacturing in the U.S. Some warn they will still drive up car prices.

Automakers facing Trump’s 25% tariff on imported cars will not also have to pay separate tariffs on materials such as steel and aluminum.