Road crashes are mainly caused by three concurrent factors: infrastructure, vehicle, and human factors. The interaction between the infrastructure and human factors leads to the concept of geometric design consistency. Recently, a global consistency model was developed based on the difference between the inertial operating speed profile and the operating speed profile. The first was defined as the weighted average operating speed of the previous road section based on distance, and represents drivers’ expectancies, whereas the second represents road behavior. However, drivers’ expectancies are related to short-term memory which declines gradually and depends on time. Thus, a time-based inertial operating speed would allow a more accurate estimation of the phenomenon. This research analyzes different periods of time and weighting distributions to identify how drivers’ expectancies should be estimated. A set of 71 homogeneous road segments located in Italy were considered in the study. As a result, 25 seconds and a convex parabolic distribution should be used to calculate the inertial operating speed profile. This new way of estimating drivers’ expectancies showed better results than those obtained based on distance. Finally, the proposed consistency model was compared with the previous models and was found to be able to assess more accurately the geometric design consistency. Therefore, the proposed consistency model is a useful tool for engineers to estimate the number of crashes so that they can incorporate road safety considerations into the geometric design of either new two-lane rural roads, or improving the existing ones.


    Zugriff

    Download

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Time-Based Calibration of the Inertial Operating Speed to Enhance the Assessment of the Geometric Design Consistency


    Weitere Titelangaben:

    Transportation Research Record: Journal of the Transportation Research Board




    Erscheinungsdatum :

    06.06.2018




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    New Consistency Index Based on Inertial Operating Speed

    García, Alfredo / Llopis-Castelló, David / Camacho-Torregrosa, Francisco Javier et al. | Transportation Research Record | 2013


    New Consistency Index Based on Inertial Operating Speed

    García, Alfredo | Online Contents | 2013



    New Consistency Model Based on Inertial Operating Speed Profiles for Road Safety Evaluation

    Llopis-Castelló, David / Bella, Francesco / Camacho-Torregrosa, Francisco Javier et al. | ASCE | 2018