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PHMSA is proposing to revise the Pipeline Safety Regulations applicable to newly constructed or entirely replaced natural gas transmission and hazardous liquid pipelines to improve rupture mitigation and shorten pipeline segment isolation times in high consequence and select non-high consequence areas. The proposed rule defines certain pipeline events as "ruptures" and outlines certain performance standards related to rupture identification and pipeline segment isolation. PHMSA also proposes specific valve maintenance and inspection requirements, and 9-1-1 notification requirements to help operators achieve better rupture response and mitigation. The rule addresses congressional mandates, incorporate recommendations from the National Transportation Safety Board, and are necessary to reduce the serious consequences of large-volume, uncontrolled releases of natural gas and hazardous liquids.