Case Studies - Lyon

An example of traffic control according to its intensity by means of the signal controlled crossings network supported by Motorola Canopy in Lyon, France.

Problem: 4.400.000 of travels is performed daily with 25% growth during the last 10 years. Passenger car is the most frequently used means of transportation. City public transportation busses are often jammed in traffic (on some routes, they travel even at 10 km/h).

Solution: Networks for signal control of crossings with Motorola Canopy controlling the traffic not according to the time of the day but according to the real conditions.

Result: A few advantages of Motorola Canopy have clearly been shown:

service continuity (100%)
data gathered in one data base (100%)
compatibility and transparency with the existing system ('CRITER')

Background: The urban community of Lyon is responsible for "traffic lights signalization" that includes 2000 crossings and their signal is controlled through the whole urban area. To make the whole traffic coherent and efficient, the computerised system connects the crossings. It makes it possible to detect even the smallest traffic breakdown and to remove it as soon as possible. Thanks to the fact that the traffic control station was moved to another place, the traffic lights now became "intelligent" and could be coordinated, not according to the time of the day but according to the real traffic conditions.

The Project consists of connected old isolated traffic controllers into GRAND LYON's 'CRITER' network (Central de Régulation et d'Information du Trafic et des Evènements Routiers). In order to make the controllers suitable for this purpose, they have been equipped with Motorola Canopy Access Point and isolated controllers have been equipped with users modules. Thanks to the results of Motorola Canopy links, the monitoring system performs traffic lights control through Canopy links in the same way as if they were connected directly to 'CRITER' network.

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