Design consistency refers to the conformance of a highway's geometry to driver expectancy. Drivers make fewer errors in the vicinity of geometric features that conform to their expectations. A technique to evaluate the consistency of a design is to evaluate changes in operating speeds along an alignment. To use operating speed as a consistency tool requires the ability to accurately predict speeds as a function of the roadway geometry. In this research project, several efforts were undertaken to predict operating speed for different conditions such as on horizontal, vertical, and combined curves; on tangent sections using alignment indices; on grades using the TWOPAS model; and prior to or after a horizontal curve. The findings from the different efforts were incorporated into a speed-profile model. The model can be used to evaluate the design consistency of the roadway or can be used to develop a speed profile for an alignment. The model considers both horizontal and vertical curvature and the acceleration or deceleration behavior as a vehicle moves from one feature to another.


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    Titel :

    Speed Prediction for Two-Lane Rural Highways


    Beteiligte:
    K. Fitzpatrick (Autor:in) / L. Elefteriadou (Autor:in) / D. W. Harwood (Autor:in) / J. M. Collins (Autor:in) / J. McFadden (Autor:in)

    Erscheinungsdatum :

    2000


    Format / Umfang :

    213 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




    Speed Prediction Models for Trucks on Two-Lane Rural Highways

    Donnell, Eric T. | Online Contents | 2001


    Speed Variability on Rural Two-Lane Highways

    Collins, Jon | Online Contents | 1999


    Speed Prediction Models for Trucks on Two-Lane Rural Highways

    Donnell, Eric T. / Ni, Yingwei / Adolini, Michelle et al. | Transportation Research Record | 2001


    Speed Variability on Rural Two-Lane Highways

    Collins, Jon / Fitzpatrick, Kay / Bauer, Karin M. et al. | Transportation Research Record | 1999


    Speed-Profile Model for Two-Lane Rural Highways

    Fitzpatrick, Kay | Online Contents | 2000