pipeline markings are required at ____________.

• A. at any place the pipeline closes a mode of transportation.
• B. at any place the pipeline crosses a road.
• C. along the pipeline at regular intervals.
• D. at the pipeline's entry point only.

Answer: (A)

Pipeline markings are there to warn and guide people about the presence of pipelines and the hazards they pose. They are required at any location where the pipeline interrupts a mode of transportation—meaning anywhere a pipeline crosses or blocks a route used by vehicles, pedestrians, trains, or any other form of transportation. This covers crossovers such as roads, railroads, or waterways where traffic would be affected by the pipeline's presence. While markings along the length of the line help locate it, the requirement focused here is on the crossing or interruption points, not only at the entry point or at regular intervals. So, placing marks where a pipeline closes a transportation route ensures responders and the public know where the hazard lies and can take appropriate precautions.