The U.S. Department of Transportation has warned California, New Mexico and Washington that they stand to lose a combined $46 million a year in federal commercial-motor-carrier safety grants for failing to enforce English-language rules for truck drivers, according to a notice released Tuesday. Transportation Secretary Duffy said the three states have 30 days to show they are requiring commercial driver’s license holders to demonstrate English proficiency, a mandate the Trump administration began enforcing nationwide on June 25. The standard obliges drivers to read road signs, complete inspection reports and communicate with law-enforcement officials in English. Federal officials contend the states continue to issue licenses to drivers who cannot meet the requirement, citing a recent fatal crash in Florida as evidence of the safety risk. The three states did not immediately comment on the enforcement action.