• Capabilities: Building Information Modelling (BIM)
  • Sectors: Transportation, Highways and Intelligent Transport Systems

Porte de Gesvres

Nantes, France - The northern part of the Nantes ring road carries out the dual function of intercity motorway and city ring road. At the Porte de Gesvres, one of the key junctions just to the north of Nantes, a one-lane per direction system has made for regular and serious congestion, preventing the free flow of traffic in and out of the city.

68,000

users on the road by 2035
Porte de Gesvres

Nantes, the sixth largest city in France, is dependent on its roads for commuters to access the city and for transit to other major French cities. The connecting roads linking the Northern Ring Road and the Eastern Ring road already see more than 48,000 users a day and this is set to rise to 68,000 by 2035. The situation at the Porte de Gesvres, one of the main connection points between the Northern and Eastern ring roads, is becoming critical, as its single lane system struggles to cope with the increased volumes of traffic. With heavy congestion now a regular occurrence, particularly during morning and evening peak hours, the convenience and safety of motorists is increasingly compromised, as traffic incidents become more likely and access for emergency service vehicles is reduced. 

The government, in partnership with local authorities, has committed to a comprehensive planning study of the Nantes ring road. They have commissioned Cofiroute, the developer of the A11 motorway, to carry out studies on how to improve passenger safety and security and ease congestion.

In partnership with Arcadis, Cofiroute have used digital technology to present a clear development strategy for the ring road. With Building Information Modelling (BIM) technology, they have been able to accurately model existing and projected states of the road and have provided simulations to analyse several possible development scenarios, enabling them to choose the best possible solution for passengers, and for Nantes.

In recognition for the work done with Cofiroute, Arcadis was awarded the Infrastructure Category of the French BIM Awards in 2016. The new development will ensure that Nantes has a safe, fast-flowing road system, suited to the needs of a busy modern city.

Outcomes

68,000

users on the road by 2035

Questions about this project

François Appere

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