Selection and Application of Warning Lights on Roadway Operations Equipment (2008) / Chapter Skim
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The passive condition refers to the use of retroreflective tape on the black test panel. Two strips of C H A P T E R 3 Static Screening Experiment The results of the literature review and survey were used to develop and conduct a static screening experiment in which 41 lighting configurations were tested in daytime and nighttime with regard to attention-getting, discomfort glare, meaning, and ability to detect using peripheral vision.
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Horizontal Maximum Peripheral Detection Angle. The horizontal maximum peripheral detection angle measured the maximum horizontal angle at which the warning light could be detected (in other words, how well the lights could be seen using peripheral vision)
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During the daytime session, subjects were instructed to rate the conspicuity of the warning lights. Subjects then performed a maximum peripheral detection task to assess 16 Rotating beacons placed on the top of the panel.
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Summary of Results Lamp Type, Intensity, and Color Comparisons The first factors considered in these analyses were lamp type, intensity, and light color. The results are summarized below, with only the significant findings discussed: • Peripheral Detection Angle – Overall, the amber and the white light sources typically performed equivalently for detection with peripheral vision; the red and the blue performed worse.
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This interaction is difficult to interpret because of its complexity. In general, a lower effective intensity resulted in a worse detection angle; the LED source performed better than the halogen source for older drivers, but was not significantly better for younger drivers; the steady condition had worse results than the flashing conditions; the higher frequency flashing seems to be just slightly worse than the lower frequency condition; and the synchronous flash was slightly better than the asynchronous.
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Neither speed nor intensity was significant for any of the four dependent variables (daytime attention-getting rating, nighttime attention-getting rating, peripheral detection angle, and glare rating)
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The Form Factor method was shown to be the best method of photometric testing for effective intensity for the purpose of this study. Each of the individual static testing metrics was compared to the Form Factor results of the light sources.
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. Discussion The results from this static experiment were specifically analyzed to enable the development of guidelines for the application of warning lights to maintenance vehicles.
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