Andorra and France Explore Alternative Routes Ahead of RN20 Road Closure in 2027

Andorra and France have begun coordinating major safety improvements along the RN20 road, following a rockfall on January 31 near Mérens-les-Vals, in the French department of Ariège. 

The planned works, expected to take place in autumn 2027, could lead to significant traffic restrictions or temporary road closures along one of the most important transport links between the two countries.

The project aims to stabilise a dangerous rock face and address a potentially unstable 300-cubic-metre rock mass, which French authorities have identified as a possible risk to road users.

The first meeting of the Franco-Andorran Strategic Committee took place on Tuesday in Foix, bringing together representatives from both countries to discuss the technical challenges, potential disruption and measures required to maintain cross-border connectivity.

The Andorran delegation was led by Esther Rabassa, Andorra's Ambassador to France, and David Palmitjavila, Director of Territorial Affairs. The meeting was chaired by Hervé Brabant, Prefect of Ariège, and also included representatives of French public authorities and the national railway company SNCF.

Controlled Explosions and Protective Barriers to Improve RN20 Road Safety

According to the Government of Andorra, French officials outlined the main safety measures designed to reduce the risk of further rockfalls along this strategically important road.

The operation will involve the controlled use of explosives to remove unstable sections of rock. These procedures will be carried out within a designated safety perimeter to protect road users, workers and nearby infrastructure.

Once the most dangerous rock formations have been removed, engineers will install protective nets and steel cables to reinforce the remaining rock face and minimise the possibility of future landslides.

However, the technical complexity of the operation has required more than six months of preliminary assessments and planning.

The RN20 is particularly important for cross-border mobility, tourism and commercial transport, making the potential impact of the works a major concern for communities on both sides of the border.

France Considers Alternative Routes During Potential RN20 Closures

One of the main issues discussed during the meeting was the potential impact of the construction works on traffic between Andorra and France.

Although the project is currently scheduled for autumn 2027, a definitive timetable has not yet been established. French authorities are therefore examining the possibility of establishing an alternative route to maintain road connections while the safety improvements are carried out.

The French government is seeking to minimise the economic and logistical consequences of any temporary closure of the RN20, particularly for residents, businesses and transport operators in Upper Ariège and Andorra.

Disruptions to this route could affect cross-border travel, commercial deliveries and access to essential services. Consequently, both governments have agreed to strengthen their coordination ahead of the planned works.

Three joint technical working groups will be established to examine the main challenges associated with the project.

These groups will focus on economic consequences, traffic management and essential services, and construction safety and public communication.

Their objective will be to identify practical solutions that reduce disruption while ensuring that the necessary safety improvements can proceed.

Monitoring Sensors Installed to Detect Dangerous Rock Movements

Meanwhile, the authorities are maintaining the monitoring systems installed following the January rockfall.

These include sensors capable of detecting movements in the unstable rock face, allowing officials to monitor potential changes in its condition.

In addition, an automated warning system equipped with traffic lights can immediately stop vehicles if the sensors detect potentially dangerous movement.

These preventive measures will remain particularly important while the authorities finalise the technical details and construction timetable.

The monitoring equipment is intended to reduce the immediate risk to motorists using the RN20 before the permanent stabilisation works begin.

Andorra and France to Hold Further Talks in Early 2027

The next meeting of the Franco-Andorran Strategic Committee is expected to take place in early 2027.

By then, officials hope to make progress on the construction schedule, the feasibility of alternative routes and the measures needed to protect cross-border mobility.

For Andorra, maintaining reliable road connections with France is essential not only for residents and businesses but also for the country's tourism industry and international accessibility.

Although no definitive RN20 closure dates have been announced, the planned works represent a significant infrastructure challenge for both countries.

The coming months will therefore be crucial in determining how the authorities intend to balance road safety, economic activity and uninterrupted access between Andorra and France.