A comprehensive assessment of protected and permitted left-turn (PPLT) signal displays was performed considering safety, operational performance, and driver-understanding measures. The research focused on a study of driver understanding of protected left-turn indications. All currently used PPLT display arrangements and protected indication combinations were evaluated, including those with simultaneous green-arrow and red- or green-ball indications and those with the green-arrow indication only. Driver understanding was evaluated through a computer-based driver survey completed by 2,465 drivers. In total, 73,950 survey responses were received pertaining to the 200 different survey scenarios evaluated, 24,863 pertaining to protected left-turn indications. Findings show that the simultaneous illumination of the green-arrow and red-ball indications in a five-section PPLT signal display during a protected left-turn phase significantly reduces driver understanding and increases driver error. This finding is especially true for drivers over the age of 65. Simultaneous illumination of the green-arrow and green-ball indications also resulted in levels of driver understanding lower than the green-arrow-only indication; however, these differences were not statistically significant.


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    Titel :

    Driver Understanding of Simultaneous Traffic Signal Indications in Protected Left Turns


    Weitere Titelangaben:

    Transportation Research Record: Journal of the Transportation Research Board


    Beteiligte:
    Noyce, David A. (Autor:in) / Kacir, Kent C. (Autor:in)


    Erscheinungsdatum :

    01.01.2002




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Driver Understanding of Simultaneous Traffic Signal Indications in Protected Left Turns

    Noyce, D. A. / Kacir, K. C. / Transportation Research Board | British Library Conference Proceedings | 2002



    Driver Expectancies of Protected/Permissive Left-Turn Signal Head Indications

    Noyce, D. A. / Fambro, D. B. / Koppa, R. J. et al. | British Library Conference Proceedings | 1996


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