This chapter exposes the ex‐ante safety assessment of a speed limit reducing operation and its implementation. The safety assessment process consists of four steps: first, accident analysis for the prior period, in order to count the speed‐ or density‐related accidents; second, analysis of the average speed and density; third, predicting new traffic conditions using fundamental diagrams where the new speed limit has already been experimented; fourth, using available relationships linking the accident count to changes in speed and density, estimating the expected changes in accidents. These relationships, calibrated on another urban motorway network, located in the South of France. Method for predicting the injury or fatality accident count begins by identifying what things might change, formulating and calibrating a model for the changes. Finally, the chapter reviews the threefold validation of the data‐driven approach, which is based on traffic models and models linking traffic conditions to accidents.


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    Title :

    Ex‐ante Assessment of a Speed Limit Reducing Operation – A Data‐driven Approach


    Contributors:

    Published in:

    Publication date :

    2016-05-27


    Size :

    22 pages




    Type of media :

    Article/Chapter (Book)


    Type of material :

    Electronic Resource


    Language :

    English




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