What is the function of an underground service alert?

The primary function of an underground service alert is to prevent accidental damage to underground utilities during excavation. This system plays a crucial role in ensuring safety and protecting vital infrastructure by notifying workers of the presence of underground utilities before excavation or construction begins. By marking or providing information about the location of these utilities, it helps to avoid situations that could lead to utility disruptions, injuries, or costly repairs.

The other options focus on different safety concerns: signaling high electric currents pertains to electrical safety protocols, warning of high methane levels relates to monitoring air quality in potentially hazardous environments, and locating above-ground electrical systems involves a different context that does not pertain to underground services. Each of these aspects addresses distinct safety measures but does not encapsulate the primary purpose of the underground service alert.