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Identification of pavement marking colors.
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    Final report.
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    Current pavement marking color specifications are given in terms of a single color with no indication of acceptable tolerances. Recently proposed standards include tolerances, but neither current nor proposed standards are based on psychophysical data. Although there is a substantial body of research regarding the visibility of pavement markings, very little has been done to test their discriminability. This research compared data obtained through a color scaling procedure, proposed standards, and existing markings. Older and younger subjects and normal and color deficient subjects participated in the color scaling study. Older and younger subjects judged colors similarly, but there were notable differences between the color judgments of normal and color deficient subjects. The findings from this study indicate that it is reasonable to specify a range of chromaticities acceptable for pavement marking colors that will be useful during both daytime and nighttime and on a variety of backgrounds or pavement types. Modifications were made to the current proposed specifications in light of these color scaling data.

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