Summary: On March 22, 2022, PHMSA announced an initiative to convert historical letters of interpretation applicable to the Hazardous Materials Regulations (HMR) that have been issued to specific stakeholders into broadly applicable frequently asked questions on its website. PHMSA requested comment on the initiative and input on the prioritization of future sets of frequently asked questions. In this notice, PHMSA is extending the comment period from May 23, 2022, until July 22, 2022. In addition, PHMSA plans to host a webinar to discuss the process and intent of this initiative with stakeholders on June 27, 2022.