Forty-eight senior citizens participated in a field study of the visibility of letters and symbols in pedestrian traffic signals. Subjects were asked to identify signal messages from distances of 18.3 m and 29.3 m, with signal voltage set at 100 percent, 75 percent, and 50 percent of full power. Incandescent, fiber-optic, and light-emitting diode commercially available pedestrian signals were tested, including 22.9-cm and 30.5-cm rectangular signal housings and two round red-amber-green signals with symbol masks. Each subject was asked to identify the signal’s location in the test stimuli array, to name the signal’s display configuration (Walk, Don’t Walk, walking person, or hand), and to assess the signal’s brightness on a five-point scale. Analyses also were conducted on the percentage of responses about “too bright” signals and subject uncertainty about the signal message. Testing was conducted only on bright sunny days but did not include the worst-case condition of direct sunlight on the signal face. The analysis of recognition, uncertainty, and “too bright” responses suggested that a signal intensity of 25 cd minimizes the frequency of both “too bright” and uncertain responses regardless of size, distance, or technology, or whether the message is symbol or text. The data further suggest that 22.9-cm incandescent signals provide sufficient visibility with less phantom effect than 30.5-cm signals.


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    Titel :

    Daytime Photometric Requirements for Pedestrian Signals


    Weitere Titelangaben:

    Transportation Research Record: Journal of the Transportation Research Board


    Beteiligte:
    Mace, Douglas (Autor:in) / Finkle, Mark (Autor:in) / Pennak, Sara (Autor:in)


    Erscheinungsdatum :

    01.01.1997




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Daytime Photometric Requirements for Pedestrian Signals

    Mace, Douglas | Online Contents | 1997


    Daytime Photometric Requirements for Pedestrian Signals

    Mace, D. / Finkle, M. / Pennak, S. et al. | British Library Conference Proceedings | 1997


    Visibility Performance Requirements for Pedestrian Signals

    National Research Council (U.S.) | British Library Conference Proceedings | 2005


    Daytime Running Lamps (DRLs) for Pedestrian Protection

    Thompson, P. A. / Society of Automotive Engineers | British Library Conference Proceedings | 2003


    Daytime Running Lamps (DRLs) for Pedestrian Protection

    Thompson, Paul A. | SAE Technical Papers | 2003