Northern semi-covered trench. Executive project, procurement, and construction of a semi-covered trench and ground-level highway. The project includes the execution of twelve vehicle and pedestrian bridges; Tranche C has a length of 2.5 km. Work execution in the urban environment without interrupting activities in the metropolitan area. Removal of 123 interferences, particularly through a 4.5-m diameter and 17-m depth double lining tunnel siphon.