Transportation Secretary Sean Duffy said more than 9,500 commercial truckers have been taken out of service for failing English-language proficiency checks, a cumulative enforcement tally he said highlights an ongoing effort to keep unqualified operators from posing dangers on the nation's roads.

"We've now knocked 9,500 truck drivers out of service for failing to speak our national language — ENGLISH!" Duffy wrote in a Dec. 10 post on X. "This administration will always put you and your family's safety first."

The tally reflects cumulative enforcement actions taken since May, when the Department of Transportation reinstated out-of-service penalties for drivers who cannot read or speak English well enough to operate a commercial motor vehicle.

President Donald Trump and Duffy have both said the renewed enforcement is necessary to ensure truckers can understand road signs, communicate with police and inspectors, and follow instructions at checkpoints and weigh stations.

"America First means safety first," Duffy said in May. "Americans are a lot safer on roads alongside truckers who can understand and interpret our traffic signs. This common-sense change ensures the penalty for failure to comply is more than a slap on the wrist."

The crackdown comes after Trump signed an executive order in March designating English as the country's official language. In April, he signed another order directing Duffy to ensure that commercial truck drivers who fail to meet English-language proficiency standards are taken out of service.

"My Administration will enforce the law to protect the safety of American truckers, drivers, passengers, and others, including by upholding the safety enforcement regulations that ensure that anyone behind the wheel of a commercial vehicle is properly qualified and proficient in our national language, English," Trump wrote in the April order. "This is common sense."

Trump's April order scrapped an Obama-era rule under which inspectors could cite truckers for failing English requirements but were not allowed to remove them from service, the Federal Motor Carrier Safety Administration said in a May memo.