Many urban freeways in Texas experience congested traffic conditions during peak periods. Freeway system expansion is very expensive and time-consuming. Consequently, alternatives other than construction of new facilities are desired. The Texas Department of Transportation has been implementing comparatively inexpensive methods to improve existing freeways such as grade-separated (i.e., braided) ramps and modified ramp configurations via X-ramp interchanges and ramp reversals. Ramp reversal, replacement of an entrance ramp with an exit ramp or vice versa, is an improvement strategy occasionally recommended by outside constituencies. The basis for this research was driven by Texas Department of Transportation (TxDOT) engineers need to have an updated methodology and evaluation results from previously implemented ramp reversal projects to assist in future decision-making. This research project investigated the benefits and impacts of X-ramp and ramp reversal projects. Impacts that were evaluated include operational, safety, and basic economic benefits. Case study evaluations of 15 projects implemented throughout the state were performed and generally showed that ramp modification projects are a worthwhile effort. The final product of this research was the development of guidelines for TxDOT staff to assist in the evaluation and implementation of ramp modification projects. The framework for the guidelines was based on the three themes for the Texas access management program: (1) improve safety and mobility, (2) provide reasonable access to developments, and (3) promote local government partnerships. Based on this framework, the 21 guidelines for successful implementation were further divided into five categories: educational, encouragement, engineering, enforcement, and evaluation.


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    Titel :

    Ramp Reversal Projects: Guidelines for Successful Implementation


    Beteiligte:
    S. A. Cooner (Autor:in) / S. Venglar (Autor:in) / Y. Rathod (Autor:in) / E. J. Pultorak (Autor:in) / J. C. Williams (Autor:in)

    Erscheinungsdatum :

    2007


    Format / Umfang :

    158 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




    Development of Guidelines for Ramp Reversal Projects, Project Summary

    S. Cooner / B. S. Bochner / E. J. Pultorak et al. | NTIS | 2006


    Evaluation of Operational, Safety and Basic Economic Impacts of Ramp Reversal Projects

    Rathod, Y. / Cooner, S.A. / Institute of Transportation Engineers | British Library Conference Proceedings | 2008


    Guidelines for Ramp and Interchange Spacing

    B. L. Ray / J. Schoen / P. Jenior et al. | NTIS | 2011



    Guidelines for developing and maintaining successful partnerships for multimodal transportation projects

    Hauser, Edd / National Cooperative Highway Research Program / National Research Council (U.S.) et al. | TIBKAT | 1999