On November 23, 2015 (80 FR 72914), the Pipeline and Hazardous Materials Safety Administration (PHMSA) published a final ruling in the federal register to correct editorial errors, make minor regulatory changes and, in response to requests for clarification, improve the clarity of certain provisions in the Hazardous Materials Regulations (49 CFR Parts 171 – 180). The intended effect of this rule is to enhance the accuracy and reduce misunderstandings of the regulations. A significant number of these corrections and clarifications originate from three recent final rules under the following dockets: PHMSA–2009–0063 (HM–250) [79 FR 40590]; PHMSA–2009–0095 (HM–224F)] [79 FR 46012]; and PHMSA–2013–0260 (HM–215M) [80 FR 1075]. The amendments contained in this final rule are nonsubstantive changes and do not impose new requirements. This final rule is effective December 23, 2015.