The 4eme Rocade d’Alger is a highway which passes about 80 km south of the Algerian capital and crosses the country from west to east. This highway is part of the main structural axes of the Algerian road and motorway scheme. The final route is 262 km long with 15 interchanges and a basic section consisting of three lanes dual carriageway plus an emergency lane in each direction. Coding is responsible for designing section 1.2, from pk 33+800 to pk 67+000, a 33.2 kilometre alignment with interchanges. The project includes structures, roadways, hydraulic works and retaining walls.