The Principality of Asturias Department of the Environment, Land Planning and Infrastructure has chosen FCC Construcción, in a joint venture, to execute the first phase of work to twin the AS-17, also known as the Riaño Tunnel road. This project falls under the new 2006-2012 Mining Plan.

The job is to build the section between San Miguel de la Barreda and the northern mouth of the Riaño Tunnels, a 4,740-metre-long section of road, and it is worth over 34 million euro.

The twinned road between San Miguel de la Barreda and Riaño will eventually form part of the layout of the future AS-III regional dual carriageway connecting Avilés and Sama. FCC Construcción also participated in the work on the section of dual carriageway that already built between Riaño and Sama.

A good portion of the future dual carriageway between San Miguel de la Barreda and Riaño will run over viaducts or underground.