Case studies

Mobility solutions map during road works

Issy-les-Moulineaux is one of the municipalities of Greater Paris, located in the southwest of the urban agglomeration. Due to its location and economic vitality, this area of the Paris Region faces substantial traffic volumes because many people from the whole Paris area transit to or through Issy for work by car.

In this context, Issy-les-Moulineaux, and the related urban agglomeration Grand Paris Seine Ouest, are heavily impacted by the decision of the central government to create, by law, a public company, Société du Grand Paris, who will deliver an ambitious project building a new automated metro line.

This major infrastructure project will see several phases of roadworks which will make Cities and other local authorities face increased traffic volumes and, more generally, congestion issues and high pressure on transport services. To this end, Issy needs to understand the consequences of the scheduled roadworks and to be able to define mitigating actions to tackle any issues arising from them. Data visualisations will help to:

  • Define overall traffic situation
  • Detect “Hot Points” and possible solutions
  • Estimate use of cars by the overall number of commuters (and possibly their origin and destination)
  • Calculate evolutions according to new situations

Once these visualisations are made available with all the needed data granularities, it will be possible to understand how the roadworks will/have impacted the overall traffic.  These can then be compare to data from other mobility services to identify how those solutions may also impact traffic.

Challenges encountered:

The biggest challenge is related to the collection of data as most of traffic data is today in the hand of private stakeholders and, at the same time, we have a big division of competences of public bodies on this subject. In a metropolitan area, you have various road segments and those are often managed by different bodies (city, department, urban agglomeration and region), this makes hard to have data, and particularly harmonized one, on all road segments.

Moreover, it has to be noticed how in a metropolitan area, it is somehow useless to have just the data about one City as this can just act on a small part of the area, making less effective any policies on the ground if this is not taking into consideration also data of neighbour cities.
Finally, data of traffic is often not compliant with the one of other mobility services, thus it is requested to find compromises to make the visualisations useful enough to make comparisons between the various services and to allow to have useful insights to evaluate the existing policies and services.


  • Issy Média, leader and coordinator of the project
  • City of Issy-les-Moulineaux, policy maker
  • Grand Paris Seine Ouest Urban Agglomeration, policy maker
  • Mediamobile France, data provider
  • SenX, data analysis
  • Geosparc, visualisation technical partner

Actions steps:

The traffic data was collected through a provider, Mediamobile, that proposed 2017 and 2018 Paris Region traffic floating car data. 

Later, a first visualisation was created to collect the first feedbacks from users and policy makers.

Now, a more advanced visualisation, i.e. a dashboard with map, is going to be created to allow to take deeper the pilot and to define the usefulness of these tools in a policymaking environment.

Lessons learned:

It may be too early to have a good picture of the visualisation impact and to have a complete set of lessons learnt, but it is clear at this stage how important it is to define a local task force including public and private bodies in the project and to have budgets to collect data from various stakeholders.

Moreover, to-date, the project highlights how a business model between the public and private sector still needs to be defined in order to work together and share data effectively.

Finally, it can be clearly stated that open data is too limited to create effective visualisations with a real usefulness, at least on traffic data project.

Outcome impact:

It is still too early to define a real impact, but it can be stated that City departments are now totally aware of the need of dashboards allowing to use data for planning and management of mobility in the City and to collaborate with other stakeholders.

Moreover, these dashboards are today considered really important also to allow the local policy makers to take decisions quickly and effectively.



Issy Traffic Map

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