This thesis documents the research comparing day and night vehicular speeds on horizontal curves on rural, two lane highways. For each selected curve, daytime and nightime operating speeds were measured using piezoelectric sensors. Speed data was collected in each direction at the midpoint of the approach tangent and at the midpoint of the curve. A vehicle's speed reduction was then calculated as the difference between the speed at the midpoint of the tangent and the speed at the midpoint of the curve. The results of this research indicate that there are some differences between daytime and nighttime speeds on rural, two-lane highways. However, because the magnitude of the difference between daytime and nighttime speeds is small for all degrees of curvature, a variable accounting for light condition is not needed for operating-speed-based profile modeling for horizontal alignment design consistency evaluation.


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    Title :

    Comparison of Day and Night Vehicular Speeds on Horizontal Curves on Rural Two-Lane Highways


    Contributors:
    J. Guzman (author)

    Publication date :

    1996


    Size :

    52 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





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