Guidelines for Nighttime Visibility of Overhead Signs (2016) / Chapter Skim
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Pages 27-34
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27 Open-Road Study With the understanding that sign lighting and increased luminance provide no marginal benefit to legibility when drivers are in conditions with low visual complexity, the research team investigated whether or not these factors affected how well nighttime drivers read signs on the open road in more visually complex settings. The closed-course study provided a controlled environment where the tested effects were investigated in a full-factorial type of experiment.
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28 images. Each study participant drove the vehicle through the designated route.
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29 sign most closely representing 40 ft/in. of letter height was extracted for measuring the luminance of the sign's legend and background.
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30 Figure 21. Legend luminance values of signs in the open- and closed-course studies.
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31 height when evaluating where drivers were able to correctly read the sign. Average recognition indices of the observations in the open-road study are provided in Table 13.
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32 Orlando had relatively low values of luminance as a result of low retroreflective sheeting (which can be seen in Figure 21)
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33 • Recognition indices in Orlando were the lowest of the three cities based on the main effect of City without any inter action. San Antonio had the greatest recognition indices.
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34 malizes the recognition distance by the letter height, was used as the dependent variable. Another difference with the openroad study was the diversity in the sign lighting and sheeting materials used.
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