PHMSA is conducting an initiative to convert historical letters of interpretation applicable to the Hazardous Materials Regulations that have been issued to specific stakeholders into broadly applicable frequently asked questions (FAQs) on its website. By creating a repository of FAQs, PHMSA seeks to eliminate the need for recurring requests for common letters of interpretations. Interested persons are invited to submit comments on the initiative and input on the prioritization of future sets of FAQs on or before May 23, 2022. 

See the Federal Register Notice for more details, which introduces the initiative and its objectives to those subject to the Hazardous Materials Regulations.