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It is twenty sensors placed at the junction between Gran Via Carlos III and Travessera de les Corts to regulate traffic lights will automatically stages and adapt to the reality of traffic at all times. The data captured by sensors installed in different parts of the road are sent automatically to the Mobility Service.
What makes the system is "measure what the volume of traffic on each access point, and based on that, determine which is the best program." In total eight sensors determine possible programming of traffic lights.

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