The number of roundabout intersections is quickly increasing around the world, mainly because of their good safety performance. However, roundabout performance can be degraded if precautions are not taken during either the design or the operation phase. Safety review methodologies are well suited for roundabout analysis, but their effectiveness can be improved substantially if the review recommendations are supported by a quantitative safety assessment. A roundabout safety assessment procedure is presented. Validation of the safety assessment procedure was carried out by a comparison of the results with empirical Bayes (EB) safety estimates. From the procedure, a safety index (SI) for roundabout approaches and for the whole number of roundabouts is assessed. The SI was assessed for 55 approaches of 15 urban roundabouts in Italy. For approaches, the correlation between the SI values and the EB safety estimates is highly significant (t = 15.62, p-value < 0.001), with 83% of the variation in the estimated number of crashes explained by the SI value. For all roundabouts, the correlation between SI values and EB safety estimates remains highly significant (t = 14.27, p-value < 0.001), with 94% of the variation in the estimated number of crashes explained by the SI value. The SI procedure makes it possible to support review recommendations by a quantitative safety evaluation. The SI can be used to rank both roundabouts and roundabout approaches by priority according to potential crash reduction from the safety measures. Furthermore, the SI procedure allows detection of safety issues that contribute the most to safety problems.


    Zugriff

    Download

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Roundabout In-Service Safety Reviews


    Untertitel :

    Safety Assessment Procedure


    Weitere Titelangaben:

    Transportation Research Record: Journal of the Transportation Research Board


    Beteiligte:


    Erscheinungsdatum :

    01.01.2007




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    New Type of Roundabout: Roundabout with “Depressed” Lanes for Right Turning – “Flower Roundabout”

    Tomaž Tollazzi / Marko Renčelj / Sašo Turnšek | DOAJ | 2011

    Freier Zugriff

    Bracknell roundabout -- Construction of roundabout under railway

    Kendal, J.T. / Palmer, R.W. | Engineering Index Backfile | 1956


    How Roundabout Entry Design Parameters Influence Safety

    Novák, Jan / Ambros, Jiří / Frič, Jindřich | Transportation Research Record | 2018


    ROUNDABOUT ASSIST

    QUIJANO ELENA | Europäisches Patentamt | 2020

    Freier Zugriff