The bill establishes English language proficiency requirements for commercial drivers and carriers in Iowa, aligning state regulations with federal standards. It mandates that commercial drivers must demonstrate sufficient English proficiency to understand safety instructions, read required documents, comprehend traffic signs, and communicate essential safety information. The bill empowers peace officers to conduct assessments during vehicle inspections and allows for out-of-service orders for drivers who fail to meet these requirements. Additionally, it prohibits any inferences based on a driver's nationality, ethnicity, race, or state of licensure, ensuring that enforcement is based solely on language proficiency.

Commercial carriers are held liable for employing drivers who do not meet the English proficiency standards, facing civil penalties of up to $100,000 for each violation. Repeat offenders may face enhanced penalties, including increased inspection frequency and potential restrictions on operating permits. The bill also provides a private right of action for individuals harmed by a carrier's violation of the language requirements, allowing for significant damages if negligence is proven. The Department of Transportation is tasked with implementing the bill's provisions, including adopting necessary rules and publishing annual reports on enforcement and compliance outcomes.