The Eix Tranversal project (C-25) was to construct 153 kilometers highway from the Lleida - Girona axis. FCC built the new highway with two lanes in each direction. The works were divided into three main sections: Cervera - Manresa; Manresa - Vic and Vic - Caldés of Malavella.
The structures built as part of the works include; ten viaducts and four tunnels among which the 730 meters long tunnel of Fontfreda was one. The design and construction work heavily focused on minimising the environmental impact as affect by the road construction.