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Benchmarking mobility emissions

The Citeair II sustainable mobility indicator has been developed to help to benchmark the traffic situation in urban agglomerations, and to describe related impacts on the environment and citizens. One of the main outcomes is a toolbox to assist decision makers in managing the traffic in a better way, informing the public and contributing to a more environmentally-friendly behaviour.

The indicator has been derived from the combination of information on traffic and on the impact of traffic on the environment and citizens (through exposure to traffic). It is assumed that one extra minute in traffic means one minute less in the background situation (home, office, leisure). Thus, the impact of traffic is calculated through examining how long a car driver, due to the traffic condition improvements/worsening, has been less/more exposed to traffic pollution agent (expressed by the value of the roadside index (CTI)). This is calculated by looking at the difference between the actual trip time ATT (updated with real-time traffic data) and the standard trip time STT (average value of ATT).

The indicator was tested with real traffic data collected from Rome and Paris. The methodology and the analysis of the results is available in the guidebook.

This indicator provides a tool to help any city in the difficult task of analysing their mobility status using a simple measure. In this context, the methodology we have defined is useful to those cities which are interested in applying simple performance measures.

Further details of the Sustainable Mobility Indicator are available in the guidebook. The annexes are available as a separate document here.

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