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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)).  Proposals in this rulemaking include, but are not limited to: the introduction of regulatory requirements to address polymerizing substances, testing criteria for polymeric beads to be excepted from regulation, transport provisions for engines and machinery powered by internal combustion engines or fuel cells, changes to the hazard communication requirements for lithium batteries, the revision of various entries in the hazardous materials table to maintain global alignment, and the incorporation by reference of various international standards. We expect the regulatory changes will result in minimal compliance costs for the regulated industry.