The study addresses two issues concerning shoulder removals: safety and traffic operations. Improvement of traffic flow is the primary reason for considering shoulder removals. However, extensive removal of both shoulders appears to be counter productive. Overall safety is improved on study sections where inside shoulders are removed to add capacity on very congested roadways (ADT greater than 20,000 vehicles per lane per day) and the congestion is reduced (ADT per lane less than 18,000 vehicles per lane per day). The improved safety appears to be the result of improved traffic operation. If congestion is less severe, then safety appears to be unchanged where inside shoulders are removed. Inside shoulder removals appear to be preferable to outside shoulder removals.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Safety and Operational Evaluation of Shoulders on Urban Freeways


    Contributors:
    T. Urbanik (author) / C. R. Bonilla (author)

    Publication date :

    1987


    Size :

    186 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    Safety Planning Study of Urban Freeways

    Kononov, Jake / Allery, Bryan / Znamenacek, Zane | Transportation Research Record | 2007


    Operational improvements for freeways

    National Research Council, Highway Research Board, USA | TIBKAT | 1971


    Systems-Level Evaluation of Automated Urban Freeways

    Johnston, Robert A. | Online Contents | 1994


    Systems-Level Evaluation of Automated Urban Freeways

    Johnston, R. A. / Ceerla, R. | British Library Online Contents | 1994