The problem of truck loss-of-control accidents on interchange ramps is examined from the viewpoint of the suitability of highway geometric design, given the pecular stability and control limitations of heavy-duty trucks. Accident records were used to identify specific ramps which were overinvolved in jackknife, rollover, and run-off-road accidents. The ramp geometries were represented in a complex simulation of the dynamic behavior of representative tractor-semitrailer combinations. The calculated responses of heavy vehicles on each ramp were studied to illustrate how highway design features may have influenced the known accident experience at the site. Results show that various aspects of the AASHTO policy on geometric design result in a very slim margin of safety for the operation of heavy trucks on exit ramps. Potential countermeasures for the identified problems are suggested.


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    Title :

    Impact of Specific Geometric Features on Truck Operations and Safety at Interchanges. Volume 1. Technical Report


    Contributors:
    R. Ervin (author) / M. Barnes (author) / C. MacAdam (author) / R. Scott (author)

    Publication date :

    1985


    Size :

    136 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





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