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The Federal hazardous materials transportation law requires the Secretary of Transportation to ensure that, to the extent practicable, regulations governing the transportation of hazardous materials in commerce are consistent with standards adopted by international authorities (49 U.S.C. 5120(b)). Harmonization enhances safety, facilitates compliance, and improves the efficiency of the global transportation system by minimizing the regulatory burden on the public, thus promoting trade. After a thorough review of the provisions recently adopted by various international regulatory bodies, PHMSA has identified areas in the HMR in which harmonization with international regulations will provide an enhanced level of safety, an economic benefit, or in many instances both increased safety and economic benefits. As a result, this rulemaking amends the HMR, where appropriate, to maintain alignment with international standards effective January 1, 2019, and consequently facilitates the safe global trade of hazardous materials. Amendments in this rulemaking action include, but are not limited to: non-testing methods to classify corrosive materials, a classification scheme and transport provisions for articles containing hazardous materials that do not already have a proper shipping name, a lithium battery test summary document, provisions to recognize one-time movement approvals issued by Transport Canada, and the incorporation by reference of various international standards including the latest editions of the UN Model Regulations, the IMDG Code, the ICAO TI, and International Organization for Standardization (ISO) technical standards applicable to cylinders.