49 CFR Part 38
Accessibility Specifications for Transportation Vehicles (Extracts).
49 CFR Part 399
Step, Handhold, and Deck Requirements for Commercial Vehicles.
Proposal of July 14, 2026
Amendments and Nonconformance Penalties for Model Year 2027 and Later Heavy-duty Highway Engines and Amendments to Inducement Provisions for SCR-equipped Diesel Engines.