The objective of the study was to develop guidelines that may be used to aid the traffic engineer in deciding whether protected/permissive (permissive) phasing is appropriate to use at a given location. An inventory identified 58 intersections in Kentucky where permissive phasing was used. Characteristics of these intersections were related to accident data to determine the effect permissive phasing has had on left-turn and total accidents. When a left-turn signal is warranted, permissive phasing should be used because of the reduced delay compared to exclusive phasing, unless the intersection has certain characteristics for which permissive phasing would create an increased accident potential. A list of conditions that would preclude the use of permissive phasing is presented.


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    Title :

    Guidelines for the Use of Protected/Permissive Left-Turn Phasing


    Contributors:
    K. R. Agent (author)

    Publication date :

    1985


    Size :

    34 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English






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