Refurbishment of the Grand-Saconnex motorway junction, Geneva

The JAG project (Grand-Saconnex motorway junction) has been developed since 2004 under the direction of the Canton of Geneva in parallel with the Route des Nations project, a cantonal tunnel project between JAG and the International Organizations district. The AP and DP phases demonstrated the value of refurbishing this junction subject to significant traffic fluctuations leading to the saturation of the related cantonal axes. The new road geometry is able to absorb traffic loads, at least until 2040, the planning horizon for motorway projects. The RE and EXE phases are underway, with the imposing constraint of maintaining all traffic flows, with nearly 300 planned motorway interventions including 9 major traffic changes

Federal Office for Roads (OFROU)

Canton of Geneva (Switzerland)

2015 – 2023

Project characteristics

  • 240 MCHF invested in studies and works (including 16 structures)
  • 4 years of work, 180 million vehicles in transit
  • 3 new bridges including the first cable-stayed bridge in Geneva

Role of Citec

In association with T-engineering and Shopfer and Niggli:

  • Data acquisition and processing
  • Definition of reference traffic conditions
  • Generation of load plans
  • Complete traffic studies phase 32, 33 (general operation, regulated intersections, staging and traffic planning during works)
  • Assembly of the phase 41 traffic lot DAO (before takeoff, tender items CAN125, 282 and 284, site plans)
  • Site monitoring and local works management (DLT) in phase 51 and 52