Russian term (edited): ������� ����

"...Since pipelines are usually buried underground, line markers and warning signs like the ones shown below are used to indicate their approximate location along the pipeline route. The markers and warning signs are in high-visibility colors (yellow or orange) and are located at frequent intervals along the pipeline right-of-way. The markers can be found where a pipeline intersects a street, highway, railway, or waterway, and at other prominent points along the route. The markers display the material transported in the line, the name of the pipeline operator, and a telephone number where the operator can be reached in the event of an emergency. Pumping stations, tank farms, and cleared rights-of-way also help signal that a pipeline is located nearby..."
http://primis.rspa.dot.gov/pipelineInfo/faqs.htm


"...Since pipelines are buried underground, pipeline markers like the ones shown above are used to indicate the approximate location of a pipeline. They cannot be relied upon to indicate the exact location of a pipeline. Pipeline markers can usually be found where the pipeline intersects a street, highway or railroad. The pipeline may not follow a straight course between markers, and the markers are limited in the information they provide. They provide no information on the depth or number of pipelines in the area..."
http://www.paalp.com/fw/main/Before_You_Dig-1384.html