On 28 October 2024, the Pipeline and Hazardous Materials Safety Administration (PHMSA) published a notice of proposed rulemaking (NPRM) (notified as G/TBT/N/USA/2155) titled 'Hazardous Materials: Advancing Safety of Highway, Rail, and Vessel Transportation (HM-265),'' proposing amendments to the Hazardous Materials Regulations (HMR) to adopt several modal-specific amendments that would enhance the safe transportation of hazardous materials in commerce by highway, rail, and vessel transportation. In response to a request for an extension of the comment period submitted by the Railway Supply Institute (RSI), PHMSA is extending the comment period for the HM-265 NPRM by an additional 90 days. The comment period for the proposed rule published 28 October 2024, at 89 FR 85590, is extended. Comments must be received by 28 April 2025. To the extent possible, PHMSA will consider late-filed comments as a final rule is developed. 90 Federal Register (FR) 1405, 8 January 2025; Title 49 Code of Federal Regulations (CFR) Parts 107, 171, 172, 173, 174, 176, 177, 178, 179, and 180: This extension of comment period and the notice of proposed rulemaking notified as G/TBT/N/USA/2155 are identified by Docket Number PHMSA-2018-0080. The Docket Folder is available on Regulations.gov at 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. WTO Members and their stakeholders are asked…