This contract concerns the execution of the completion works for the Bouassida interchange located at the intersection of the Km4 ring road and National Road RN1 at PK265 in the city of Sfax. The works include the construction of a ring road consisting of two adjacent structures crossing the SNCFT railway and RN1, two ramps in the form of structures crossing the SNCFT railway, and a roundabout on RN1.