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Dynamic road management

To improve the level of service provided by infrastructure

‘Usable’ space for traffic has reached its limit, while needs continue to intensify and diversify: congestion is increasing and becoming more frequent. We need to optimise these spaces.
Dynamic road management is therefore an important new means of operating roads, designed to be shared, with a firm focus on improving the level of service. Two key examples are:

  1. Saint Nazaire Bridge: On this three-lane bridge, real-time traffic management of the middle lane means that it changes direction depending on traffic peaks. In the morning, it is reserved for traffic heading to Saint-Brévin/Saint-Nazaire, and in the evening, it’s the reverse.
  2. the shared-use express lane on the A48 towards Grenoble: authorised buses are allowed to use the hard shoulder when the motorway lanes are congested, in compliance with appropriate regulations.

Real-time traffic lane management on Saint Nazaire bridge

Egis provided the design and full EPCM for this project. The systems in place contribute to ensuring safety and optimising the flow of traffic, particularly during rush hours and during incidents. This project was the subject of a ministerial order for this unique experiment in France.
This project = a 30 minute reduction in rush hour traffic jams for a structure of just a few km.

Pont de St Nazaire - Testimonial / a very positive outcome

“The dynamic lane allocation system has helped optimise traffic management and ensure better traffic flow. Travel time along this road has settled at a steady 4 to 6 minutes, instead of the 8 to 20 minutes needed previously. The initiative is safer too, with cameras calculating the average authorised speed at 70 kmph over a 4 km stretch. Long-term fuel savings and fewer CO2 emissions are also significant advantages. And last but not least, users are satisfied with the system, with no issues with understanding.” explains Bruno Caillabet, Director of Travel at the Loire Atlantique Departmental Council


Shared-use express lane on the A48 in Grenoble

Voie BUS sur autoroute - RER routier
Voie BUS sur autoroute – RER routier

Egis provided the design and full EPCM of this project, which involved a major first: use of the hard shoulder at peak times for public transport.

How it works

  • When the average driving speed of motorists along this section exceeds 50 km/h, the express lane is closed, and its use by buses is not authorised.
  • When the average speed of motorists falls below 50 km/h with slowdowns and traffic jams, the dedicated lane is opened to buses.
  • Every 500 metres, signs inform users that the express lane is open.

Ce projet a nécessité :

  • D’aménager l’Infrastructure existante pour créer la voie spécialisée partagée
  • De mettre en place des équipements dynamiques le long du tracé du « RER Routier », afin d’assurer la sécurité des usagers de la voie spécialisée et de la section courante,
  • De mettre en place une Interface avec le PC Gentiane, le PC de gestion des équipements des Voies Rapides Urbaines Grenobloises géré par l’Etat : Direction Interdépartementale Centre Est (DIR CE).

Smart and dynamic sharing of bus lanes

What if bus lanes were only used exclusively by buses when they travel along them? This is the idea behind an experiment conducted in Lyon (French town) on Avenue Lacassagne.

An innovative approach to road sharing!

The idea is simple: when a bus enters the lane, it triggers a light system (signs further up the road and red LEDs in the ground). This tells other motorists in real time whether the lane is being used by a bus or not. By optimizing space in this way, the dynamic bus lane revolutionizes the urban approach of segregated transport lanes, which is frequently a source of conflict between motorists and public transport. Moreover, as it can be replicated, this can help to optimize transport infrastructure to reduce city congestion on other sites.

copyright Yves Cohen

This solution was tested in partnership with Eiffage Energie, the city of Lyon (french town), Sytral and Keolis with a trial project managed by Caisse des Dépôts. It was selected following a call for projects launched in 2015 as part of the Programme of Investment for the Future (PIA). Watch and listen to the report on Youtube (french video)