Rehabilitation & Modernization of the Transgabonaise Libreville-Franceville roadAssistance to the project owner, Preliminary design & CAD

Lieu : Gabon

Client : Société Autoroutière du Gabon

Date : 2019 - 2022

Le projet

SAG – Société Autoroutière du Gabon (Olam Arise & Meridiam) has signed a public-private partnership (PPP) in 2019 with the government of the Gabonese Republic for the 30-year concession of the link between Libreville and Franceville, known as the “Transgabonaise”.

Setec was commissioned to draw up a Detailed Project Report and design-build tender documents for the rehabilitation and upgrading of 828km of road, according to the following phasing:

  • Phase1:
    • 80 km of two-lane national road from kilometre points 24+500 to 105+000 on Route Nationale 1 ( RN1) and,
    • 50km of national road along Route Nationale 3 from the village of Mikouyi (junction of Route Nationale 6 with RN3) towards Libreville.
    • including traffic and revenue studies on the Transgabonaise between Libreville and Franceville.
  • Phase 2: 337 km on RN3/RN2 between Alembé and Mikouyi (50 km point phase 1)
  • Phase 3:
    • PK0 to PK24 on the Libreville road
    • 135Km from PK105 (RN1) to Alembé (RN3)
    • 192Km on the RN3 between Mikouyi and Franceville
  • 10 Toll plazas (total design)



93km de route réhabilitées selon les normes internationales
1 filiale sur place qui accompagne le projet localement : setec infra gabon
1.260 riverains accompagnés quotidiennement

Nos missions

  • Management and execution of field campaigns: topography, geotechnics, hydraulics, traffic and weighing,
  • Preliminary design of the development including the following components:
    • Rehabilitation of roadway and platform
    • Rehabilitation of hydraulic structures and longitudinal drainage,
    • Signage and safety equipment
    • Barriers and toll systems
    • Maintenance and operation center
    • Longitudinal improvements in residential areas (parking lots, sidewalks, etc.),
  • Cross-functional assistance missions:
    • Diagnosis of existing engineering structures
    • Toll weighing study
    • Traffic and revenue studies
    • Management of economic and financial studies
    • Maintenance and operation strategy
    • Participation in ministerial decision-making bodies
  • Preparation of design-build contracts (FIDIC SILVER BOOK)
  • Tender analysis and negotiations
  • Follow-up assistance

Nos expertises mobilisées

Rehabilitation & Modernization of the Transgabonaise Libreville-Franceville road

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