The first multi-lane roundabouts in Alaska were constructed in 2004 at the ramps of the Dowling Road/Seward Highway interchange in Anchorage. These serve as junctions for commuters accessing the Seward Highway. As vehicle traffic in Anchorage continues to grow, however, use of the Dowling roundabouts also increases. The roundabouts are currently operating at or near capacity, with long vehicle queues at their entrances during peak traffic hours. This research project examined the performance of multi-lane roundabouts and how drivers use them. Analysis showed that extended queues were due to unbalanced flow patterns at the roundabouts, causing high circulating flow in front of one roundabout. This high circulating flow resulted in low-capacity, high-delay queue values. Researchers also found that accident rates and danger to pedestrians had increased in the past two years. Modeling traffic flow patterns for several possible alternatives suggested that reducing the eastbound flow rate upstream of the roundabout by 70% of the original flow could result in an acceptable level of delay and queue length at the eastbound approach of the west roundabout.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Performance Analysis of the Dowling Multi-lane Roundabouts in Anchorage, Alaska


    Beteiligte:
    T. Moses (Autor:in) / T. Eckoff (Autor:in) / B. Connor (Autor:in) / R. A. Perkins (Autor:in)

    Erscheinungsdatum :

    2010


    Format / Umfang :

    113 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




    Implementing Multi-Lane Roundabouts in Urban Areas

    Thieken, S.L. / United States | British Library Conference Proceedings | 2008



    Implementing Multi-Lane Roundabouts in Urban Areas

    Thieken, S. L. / Institute of Transportation Engineers | British Library Conference Proceedings | 2007


    Multi-Objective Evaluation Model of Single-Lane Roundabouts

    Ahmed, Hend / Easa, Said M. | Transportation Research Record | 2021

    Freier Zugriff

    Developing a method of multi-lane roundabouts capacity

    N. M. Karimov / A. Yu. Mikhailov | DOAJ | 2023

    Freier Zugriff