Addresses the permanent marking of hazardous liquid pipeline transportation facilities. It covers the design, message, installation, placement, inspection, and maintenance of markers and signs on pipeline facilities located onshore and at inland waterway crossings. Markers and signs indicate the presence of a pipeline facility and warn of the potential hazards associated with its presence and operation. The markers and signs may contain information to be used by the public when reporting emergencies and seeking assistance in determining the location of a buried pipeline.The provisions of this RP cover the minimum markers and sign requirements for liquid petroleum pipeline facilities. Alternate markers, which are recommended for some locations under certain cirumstances, are also discussed. The pipeline operator is responsible for determining the extent of pipeline marking. Consideration should be given to the consequences of pipeline failure or damage; hazardous characteristics of the commodity being transported; and the pipeline proximity to industrial, commercial, residential, and environmentally sensitive areas. The pipeline programs are also integral parts of the piepline operator maintenance and emergency plans. This RP is not intended to be applied retroactively. Its recommendations are for new construction and for normal marker maintenance programs subsequent to the effective date of this edition.