Summary: Results are presented of an analysis of the critical safety issues in transporting and storing liquefied natural gas and liquefied petroleum gases (propane and butane). Volume 1 of the report contains the Executive Summary and 21 chapters, as follows: Introduction; Primer; Vulnerability of Storage Tanks and Containment Dikes to Natural Forces; Crack-Induced Failure of Metal LNG Tanks; Flow Over Containment Dikes; Ship Design, Personnel, and Operations; Truck Shipments; Train Shipments; Vulnerability of LEG Facilities to Sabotage; The Cleveland LNG Accident of 1944; Liability and Compensation; Detonation and Flame Propagation Research; The Capability of Non-Urban Sites To Meet Total U.S. Import Requirements for LPG; The Capacity of Non-Urban Sites To Meet Total U.S. Import Requirements for LNG; Federal, State, and Local Regulations; Federal Regulation of LEG Trucks and Railcars; The Federal Power Commission; LNG Use in Japan; Overall Conclusions and Recommendations; and GAO Treatment of Agency and Company Comments. Volume 2 is comprised of 14 appendices that support and supplement the chapters. In Volume 3, comments on a draft of the report by the Departments of Commerce, Energy, State, and Transportation, the Interstate Commerce Commission, and the National Transportation Safety Board are provided.