Pierre-sur-Haute: Driving the Restricted Military Road in the Massif Central
At 1,631m (5,351ft) above sea level, the summit of Pierre-sur-Haute is the highest point of the Monts du Forez in the Massif Central. Located on the boundary between the Loire and Puy-de-Dôme departments in France, the peak is occupied by a military radio station and a civilian relay tower. The road leading up is not a standard public highway: it is a strategic access closed to private vehicles.
| Road facts: Pierre-sur-Haute | |
|---|---|
| Location | Auvergne-Rhône-Alpes, France |
| Elevation | 1,631 m (5,351 ft) |
| Length | 14.3 km (8.8 miles) |
| Surface | Paved (North) / Unpaved (South) |
| Access | Restricted / Military |
What is the road to Pierre-sur-Haute like?
The route spans 14.3 km (8.8 miles) and runs north-south, connecting the D40 road at Col du Béal with the D106 at Le Perrier. While the road is well-maintained to service the antennas at the top, keep in mind that the final section is strictly forbidden for private cars. Only military personnel, TDF technicians, and emergency services are allowed to drive to the very summit.
Is the climb to the summit paved?
The ground condition changes completely depending on which side you take. The northern side, starting from Col du Béal, was fully paved in 1961 to allow heavy trucks to reach the station. It is a very narrow strip of asphalt with no painted road markings and no safety barriers. The southern side is different: it remains a rough dirt track where, during heavy winter snow, the military often has to use tracked vehicles to reach the facilities.
What is at the top of Pierre-sur-Haute?
The summit houses a military radio station for the French Air Force and a civilian TDF relay tower. The entire area is enclosed by a high wood and metal security fence. Because it is a strategic site, they try to keep the road open year-round, but the heavy storms of the Massif Central often require specialized snowplows to clear the path for authorized vehicles.
What are the main hazards on this route?
The biggest risk for authorized drivers is the extreme wind and sudden ice. At over 1,600 meters, the weather can flip in minutes and thick fog can leave you with zero visibility. For everyone else, the main risk is simply ignoring the "no entry" signs for the military zone. Also, watch out for hikers walking on the narrow asphalt from Col du Béal; in many spots, there isn't enough room for a car and a pedestrian at the same time.
Pic: Gilles G.