This legislation, known as the Commercial Motor Vehicle English Proficiency Act, aims to enhance safety by modifying the testing requirements for commercial motor vehicle operators. It mandates that, two years after its enactment, individuals must demonstrate English language proficiency to pass knowledge tests and obtain certification to operate commercial motor vehicles. Specifically, applicants must prove their ability to understand and communicate effectively in English while operating, which includes reading traffic signs, interacting with traffic safety officers and border patrol agents, and providing or receiving directions. A significant provision of the bill is the prohibition, also effective two years post-enactment, against administering any commercial motor vehicle knowledge test in a language other than English. The Secretary of Transportation is directed to update relevant regulations to implement these new requirements.