The d´Envalira tunnel is the highest in Europe and aorms a road connection between the north of the Andorra and the south of France. It consists of a single 2.87 kilometers tunnel with a single carriage way. This tunnel was excavated from the two mouths simultaneously using the New Method Austrian (NATM). Excavation methods varied from the use of explosives in areas of harder rock and machine excavation in more suitable strata.
Respect and conservation of the natural environment has been guaranteed.
The tunnel d´Envalira is one of the main vehicle access channels in the central Pyrenees area and the
only underground passage that connects Andorra to France.