C-37 Les Preses and Olot bypass
Infraestructures.cat / Generalitat de Catalunya
The road crosses La Garrotxa volcanic area through a 2.5 km two-way tunnel and the Fluvia River on a 420 m viaduct.
Design of 3 ecoducts (underground cut and cover tunnels) across important agricultural and wildlife areas, each about 900 m long.
Design of the final 400 m underground section under existing roads.
Detailed design, including landscape integration study, traffic study and flood risk study.