FMCSA proposes to codify the English language proficiency (ELP) driver qualification requirement as an out-of-service (OOS) violation. AbbreviationsCBI Confidential business informationCE Categorical exclusionCFR Code of Federal RegulationsCMV Commercial motor vehicleCVSA Commercial Vehicle Safety AllianceDOT Department of TransportationELP English language proficiencyE.O. The North American Standard Out-of-Service Criteria is non-binding guidance to assist Federal and State personnel to determine whether to place a vehicle or driver out-of-service. As with the May 2025 policy memo, the April 2026 policy memo applies to FMCSA enforcement personnel only. Consistent ELP enforcement would ensure drivers possess the vital ability to read and understand English-language highway traffic signs and signals.