Preliminary design project of the upgrade to 2+2 lanes with median of the RN1 road (Trans Sahara Road) linking La Chiffa and Boughzoul over a length of 125 km. Alignment, hydrological, environemental and structural design.
Total width of 22 m. 26 km of complementary track for heavy vehicles in sections with high gradient. 22 grade-separated interchanges. 8 bypass for the agglomerations. 12 km of lateral pavement and 48 km of trail restoration, 32 viaducts (12.5 km), 39 bridges (3.8 km) among other minor structures.

Algeria (2007-2009)