Concession highway “Rutas del Loa” in the Antofagasta region, covering the communes of Sierra Gorda and Calama (Chile)

• Length: 111,8 km to double lane of route 25 (between the link of Carmen Alto and the city of Calama)
• 24,6 km ring road in the city of Calama, which will link different routes
• 345 m viaduct over the Loa River