Within Trendline, a project co-funded by the EU, a series of basic Key Performance Indicators (KPIs) are calculated including one on speed defined as the percentage of vehicles travelling within the speed limit. In order to supplement this basic KPI and provide a good further insight into overspeeding, Alternative Speeding Indicators (ASI) were suggested taking into account national facts on speed limits, distribution of vehicle types and road types. These included: a) the percentage of vehicles travelling 10km/h, 20km/h or 30km/h faster than the speed limit b) speed variation expressed by the difference between the lowest and highest 10% of speeds per road type or area type or speed limit or vehicle type. Pilot implementation of these ASI showed that the same data are needed for the development of KPI Speed and ASI but they must be differently analysed. Generally, the percentage of vehicles overspeeding decreases at higher overspeeding levels showing a restrained inclination to speeding. In most cases the higher the speed limit is, the higher the speed variation gets showing different behaviours towards speeding in different contexts. Meaningful overspeeding intervals differ among Member States implying different levels of tolerance against speeding reflected in the respective enforcement practices and sanctions.
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