Which information is required on a pipeline marker?

The requirement for information on a pipeline marker is crucial for ensuring public safety and awareness of the potential hazards associated with pipelines. The correct answer highlights that the pipeline owner's phone number must be included on the marker. This enables individuals who see the marker to easily contact the owner for inquiries or to report incidents or emergencies related to the pipeline.

Providing a direct line of communication to the pipeline owner is essential in emergencies, as it allows for a prompt response from the operator, who is equipped to handle incidents and may provide critical information regarding the materials being transported. While markers may also feature information about the pipeline's location, the type of materials being transported, and emergency contacts for local authorities, the inclusion of the owner's phone number ensures that the responsible party can be reached directly, enhancing safety and response efforts.