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PHMSA is considering amendments that would address 19 petitions submitted to PHMSA. These petitions request revisions to the Hazardous Materials Regulations (HMR) for clarification, enhanced safety, or economic benefit with no reduction in the level of safety. This rulemaking responds to petitions that offer more efficient and effective ways of achieving the shared goal of safe and secure transportation of hazardous materials in commerce. An example of these petitions includes a request for PHMSA to increase the service life of the HM-246 compliant tank cars from 20 years to 50 years for the transportation of Poisonous by Inhalation/Toxic by Inhalation hazardous materials. This rulemaking also addresses a petition to no longer require an emergency response number for shipments of excepted quantities of hazardous materials. These petitions were submitted per PHMSA's rulemaking procedure regulations, in 49 CFR 106.95, which allow for persons to request that PHMSA add, amend or delete a regulation by filing a petition for rulemaking containing adequate support for the requested action. The actions taken in this rulemaking are expected to provide regulatory relief to the regulated community while enhancing safety.