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8 km

long HOV lane on the A48

10 minutes

of time saved by motorists using this lane

1st

HOV lane on the highway in France

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The challenge

In the face of chronic traffic congestion at peak times on the A48 highway, at the approach to Grenoble, and the pollution generated by this congestion, highway manager AREA/APRR decided to take action to promote more sustainable mobility habits and improve the daily lives of motorists.

The solution

To encourage cleaner driving practices, AREA/APRR chose Arcadis to design and construct a special HOV lane and to ensure compliance with the rules for traveling in this lane.

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    Arcadis led the way on an innovative project on a French highway: the design of a system making it possible to reserve a lane for carpooling drivers when traffic becomes congested.


    Arcadis designed and implemented the entire system, capable of adapting to traffic conditions. When a traffic jam occurs, the solution activates. An automatic detection system allows the number of passengers per vehicle to be counted. The carpool lane is marked with a new road sign: a white diamond. It is limited to 50 km/h and reserved for carpooling vehicles, non-polluting (Crit'air 0) vehicles and taxis.


    The first HOV lane on the highway in France has been in operation since September 30, 2020 on the A48, on an 8-km stretch between Voreppe and St-Égrève.

The impact

The first of its kind in France, this 8-km HOV lane brings to life the desires of communities and the nation to encourage carpooling and change mobility habits to encourage behaviors that are more environmentally friendly. Encouraging vehicle users to carpool is thus an important lever for reducing the carbon footprint of motor vehicle travel and improving air quality. In addition, the new infrastructure is expected to save 10 minutes of travel time for the motorists using it and to reduce traffic congestion.


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