(NewsNation) — Transportation Secretary Sean Duffy warned California, Washington and New Mexico could lose millions in federal funding if they fail to enforce English language proficiency standards for commercial truck drivers.

The announcement Tuesday followed a deadly crash in Florida, in which a truck driver is accused of making an illegal U-turn, killing three people. An investigation into the incident found what Duffy called significant failures in the way the three states enforced rules for drivers that took effect in June.

Federal guidelines require truck drivers to pass roadside English tests and demonstrate the ability to read and speak English, though enforcement is left to individual states.

“States don’t get to pick and choose which federal safety rules to follow,” Duffy sai

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