The overall objective of the project was to determine if the present Montana 2-4 lane transitions constitute a traffic hazard. Twenty transitions were selected for study all of which were on the Interstate System except one which was on the Primary System. The specific objectives of the study were to determine the relationship between (1) the type of transition and the number of accidents; (2) the type of transition and the amount of wrong-way traffic; and (3) the number of accidnets on each type of transition and the type or number of traffic control devices present. The transitions were divided into three categories: (1) 2-lane traffic enters 4-lane with no appreciable change in direction, (2) 2-lane traffic enters 4-lane with an appreciable change in direction, and (3) sections where neither the 2-lane nor the 4-lane make an appreciable change in direction. The third type of transition design was found to have the highest average percent of wrong-way traffic while the first type had the lowest average percent of wrong-way traffic. Interviews with Highway Patrol and Maintenance personnel agreed with actual count data that during the summer months less than 0.1% of the vehicles traveled in the wrong direction into the 4-lane sections. However, the interviews revealed that wrong-way movement increases considerably during the winter months when visibility is poor and snow covers the highway. The study was not carried into the winter months. Analysis of the small number of accidents occurring at any one transition could not be related to the type of transition or the traffic control at the transition. (Author)


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    Titel :

    2-4 Lane Transitions


    Beteiligte:
    R. J. Graham (Autor:in)

    Erscheinungsdatum :

    1964


    Format / Umfang :

    22 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




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