The vehicle emission simulation feature of the TEXAS (Traffic Experimental Analytical Simulation) Model for Intersection Traffic in its Version 3.2 was used to demonstrate the potential fuel savings that can be realized from the provision of free u-turn lanes at diamond interchanges. More than 2000 runs of the model were made to compare the estimated amount of fuel consumed by u-turning vehicles using a free u-turn lane with that consumed by a similar number of such vehicles reversing direction through the two closely-spaced intersections of this type interchange. The observed traffic, geometric configuration, and traffic signal control at six existing diamond interchanges in Texas served as the basis for case studies in this research. Each interchange was evaluated over a range of traffic volumes and u-turn demand scenarios with, and without, free u-turn lanes.


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    Comparison of Diamond Interchanges with Roundabout Interchanges

    Bared, J. G. / Kaisar, E. I. | British Library Conference Proceedings | 2000


    Diverging Diamond Interchanges

    Rotoli, L. / Institute of Transportation Engineers | British Library Conference Proceedings | 2009


    Signalization of diamond interchanges

    Spitz, S. | Engineering Index Backfile | 1964


    Safety Evaluation for Turnarounds at Diamond Interchanges: Assessing the Texas U-Turn

    Dixon, Karen K. / Avelar, Raul E. / Dastgiri, Maryam Shirinzadeh et al. | Transportation Research Record | 2018


    Real-time optimization at diamond interchanges

    Venglar, S. / Urbanik, T. / Liu, J.C. | Tema Archiv | 1995