Route Nationale 77 – Djen Djen To El Eulma

A major infrastracture project - Design and construction of 110 km of highway

  • Djen Djen, Algeria
  • Bridges & Viaducts, Motorways & Roads, Tunnels
  • Ongoing (Completion date: 2023)


Total investment


  • 110 km of dual carriageway;
  • 54 viaducts;
  • 20 overpasses;
  • 15 underpasses;
  • 12 interchanges;
  • one 1.85-km-long twin tunnel;
  • approximately 67 km of local road modifications and upgrades.


Design and construction of the National Route No. 77 has been identified as a key milestone for the economic and social development of the country.

The project, connecting the port of Djen Djen to the inland and the East-West motorway, will be a major economic catalyst and an important factor in restarting the whole economic regional sector.

The RN77 project is a challenging undertaking due to a number of specific factors and requirements:

  • challenging geological conditions in the central part of the alignment;
  • extreme meteorological conditions;
  • deep excavation required to place piles and pile caps;
  • location in a highly seismic area;
  • management of multiple simultaneous work fronts with an average of 5,000 employees on site.

Companies involved

Rizzani de Eccher Deal Tensa

Our group

General contracting

Specialized contracting

Other activities