This paper mainly quantifies the safety effects of ramp spacing, and other geometric design elements of highway facilities. Negative Binomial (NB) regression models have been applied to estimate of different accident types, including total crashes, fatal-plus-injury crashes, single-vehicle crashes and multiple-vehicle crashes. Data for model estimation was collected in 112 freeway segments where each entrance ramp is followed by an exit ramp on I-5 in the Washington State, US. Three years (2005-2007) of freeway crashes has been examined by the NB model. The modeling results have been geared into the development of accident modification factors (AMFs) for ramp spacing that can be used safety prediction of freeways. Furthermore, the results also suggest some geometric designs are recommended to improve freeway safety


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    The Relationship between Freeway Safety and Geometric Design Elements


    Contributors:

    Published in:

    Advanced Materials Research ; 424-425 ; 215-219


    Publication date :

    2012-01-03


    Size :

    5 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English






    Evaluating the Effects of Freeway Design Elements on Safety

    Park, Byung-Jung / Fitzpatrick, Kay / Lord, Dominique | Transportation Research Record | 2010


    Freeway and Interchange Geometric Design Handbook

    Leisch, J. P. / Institute of Transportation Engineers | British Library Conference Proceedings | 2006


    Freeway and interchange : geometric design handbook

    Leisch, Joel P. / Institute of Transportation Engineers | TIBKAT | 2005