The National Highway Traffic Safety Administration (NHTSA) is finalizing minor technical amendments to the test procedures for heavy-duty engines and vehicles to improve accuracy and reduce testing burden. These amendments affect the certification procedures for fuel efficiency standards and related requirements. These amendments increase compliance flexibility, harmonize with other requirements, add clarity, correct errors, and streamline the regulations. Given the nature of these changes, NHTSA does not expect either significant environmental impacts or significant economic impaacts for any sector. This final rule is effective on May 14, 2024. Title 49 Code of Federal Regulations (CFR) Part 535. This final rule and the proposed rule notified as G/TBT/N/USA/1917 is identified by Docket Number NHTSA-2020-0079. The Docket Folder is available on Regulations.gov at https://www.regulations.gov/docket/NHTSA-2020-0079/document and provides access to primary and supporting documents as well as comments received. Documents are also accessible from Regulations.gov by searching the Docket Number.
USA – Improvements for Heavy-Duty Engine and Vehicle Fuel Efficiency Test Procedures, and Other Technical Amendments
