Color Effectiveness of Yellow Pavement Marking Materials: Full Report (2008) / Chapter Skim
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Pages 79-84
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79 CHAPTER 7: DISCUSSION AND CONCLUSIONS Color naming and discrimination, especially when it comes to white and yellow colors, depends heavily on the chromaticity and luminance of the sample, and the spectral power distribution of the light source under which the sample is observed. The correlation between trichromatic properties and perceptional attributes is a stochastic process.
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80 that the upper half, especially the upper left region of the ASTM D6628 nighttime yellow color box, where the chromaticities are closer to yellow-green than yellow-orange, there is a higher risk of confusion with white. The white iso-chrome curves for low luminance levels extend and encroach well into this upper section of the color box for incandescent light sources.
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81 The currently available National Transportation Product Evaluation Program (NTPEP) pavement marking test decks were measured for chromaticity under daytime (0/45)
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82 RECOMMENDATIONS Based on the results of this work, we recommend changes to the nighttime yellow and white color boxes. The size and shape adjustment of the existing color boxes is proposed to reduce confusion between yellow and white pavement marking materials.
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83 Table 10. Recommended 05-18 Nighttime White Color Boundary x y 0.45 0.42 0.41 0.40 0.43 0.38 0.47 0.40 0.46 0.42 The fifth recommendation is to leave the daytime white and yellow color regions unchanged.
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From page 84... ...
84 material fluctuation in chromaticity. The newer 30-m geometry instruments have a smaller uncertainty therefore the pavement marking material should be sampled three times.
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