In the East section, at Djebel El Ouahch, starts the double-bored tunnel T1 Djebel dug with traditional techniques. The motorway project crosses Algeria parallel to the Mediterranean coasts. The highway connects the Tunisian border near the city of El Kala with the border with Morocco near Maghnia, passing close to the main Algerian cities of the north.
This tunnel rehabilitation operation of the East-West motorway is not complete yet for several reasons related to the complexity of the relief which constitutes a real danger for the workforce. The tunnel route meets complex geological conditions with predominance of clays. The actions carried out in accordance with the implementation of a schedule set by Cosider technicians take into into consideration the reservations and solutions proposed in the conducted study, noting that security, protection, and technical intervention measures have been taken to accelerate the work.