Although not part of the official highway code signs, this one provides crucial information. When driving along a departmental road or in fields, signs like this one are part of a universal marking system used to warn of the presence of various underground infrastructures such as gas pipes (indicated by a yellow triangle), water pipes, power lines (indicated by a red triangle), and communication systems. Just approach the triangular metal post to read the precise indication.
An important indication
In reality, these enigmatic signs can be difficult for drivers to decipher at first glance. According to several sites, this sign topped with a metal hat serves more as an indicator for network managers. Indeed, to ensure the proper functioning of their installations, they conduct low-altitude overflights using light aircraft. This allows the pilot or operator to spot unexpected features on the surface, such as unplanned work, dead vegetation that could indicate a possible leak, or conversely, excessive tree growth that needs to be removed, as well as landslides that could jeopardize the network.
Poles equipped with a yellow triangle are used internationally to indicate combustible gases, including natural gas and propane. It is an attention-grabbing color associated with caution. In addition to the color, these signs often bear symbols, letters, or numbers to provide additional information. For example, they may include the word “Gaz” or “Gas” and sometimes an emergency phone number or the name of the utility company responsible for the pipeline. The arrow on the sign usually indicates the direction of the pipeline underground. This helps emergency services and maintenance teams locate and track the pipeline's route.
The poles with a red triangle were installed by the electricity transmission network RTE. In this case, they indicate the presence of a nearby 225,000-volt high-voltage underground line. In addition to these buried lines, RTE also operates a network of 400,000-volt overhead lines, which are more visible. Thanks to this infrastructure, electricity supply is guaranteed for all homes in France.
This RTE network map shows the existing electricity transmission network (high and very high voltage lines, electricity pylons).
Precise signage
Construction work or any activity that involves digging in the area requires precise location of pipelines to avoid accidents. If underground work must be carried out near poles equipped with these triangles, it is therefore important to notify the network manager to avoid any potential danger.
In the event of an incident, you can note that a telephone number and a beacon number are indicated so that you can contact them immediately. Many countries have services that builders must call before starting to dig. This service will mark the exact location of underground pipes in the planned work area. These signs also help identify areas that require inspection or repair.
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