Left-turn movements at intersections, including drivewaysespecially movements that are made from lanes that are shared with through trafficcause delays and adversely impact safety. Although left-turn warrants have been updated, many agencies still use research performed by M. Harmelink from the mid-1960s. While most states use procedures that are based on Harmelink, a number of limitations of Harmelinks procedure have been identified. Economic analysis can provide a useful method for combining traffic operations and safety benefits of leftturn lanes to identify situations in which left-turn lanes are and are not justified economically. This project used a benefit-cost approach to determine when a left-turn lane would be justified. The steps included simulation to determine delay savings from installing a left-turn lane, crash costs and crash reduction savings determined from safety performance functions and accident modification factors available in the Highway Safety Manual, and construction costs. Left-turn lane warrants were developed for rural two-lane highways, rural four-lane highways, and urban and suburban roadways. In addition, warrants for bypass lanes were developed for rural two-lane highways. A Design Guide on Left-Turn Accommodations at Unsignalized Intersections was developed that discusses left-turn lane designs, traffic control treatments, and case study examples.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Development of Left-Turn Lane Warrants for Unsignalized Intersections


    Beteiligte:
    K. Fitzpatrick (Autor:in) / M. A. Brewer (Autor:in) / J. S. Gluck (Autor:in) / W. L. Eisele (Autor:in) / Y. Zhang (Autor:in)

    Erscheinungsdatum :

    2012


    Format / Umfang :

    270 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




    Development of Left-Turn Lane Warrants for Unsignalized Intersections

    Fitzpatrick, Kay / Brewer, Marcus A. / Eisele, William L. et al. | Transportation Research Record | 2012



    Warrants for Exclusive Left Turn Lanes at Unsignalized Intersections and Driveways

    J. N. Ivans / A. W. Sadek / M. Zhou et al. | NTIS | 2009



    Warrants for right-turn treatments at unsignalized intersections on rural two-lane highways

    Hasan, T. / Stokes, R.W. / Canadian Society for Civil Engineering | British Library Conference Proceedings | 1998