Color Effectiveness of Yellow Pavement Marking Materials: Full Report (2008) / Chapter Skim
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18 CHAPTER 4: DARK-ROOM REAR-PROJECTION SCREEN EXPERIMENT This experiment was conducted in a dark hallway with a 4ft by 7ft calibrated rear-projection screen and projector located at the end. The purpose of the experiment was to determine color classification responses for a common pavement marking viewing geometry.
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19 judgment of pavement marking color (white vs. yellow)
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20 tape, and yellow alkyd paint. The headlamps were 2000 year model Ford Taurus VOA headlamps in all cases.
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21 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 x y Screen gamut Chromaticity-0 Chromaticity-1 Chromaticity-2 Chromaticity-3 Chromaticity-4 Chromaticity-5 Chromaticity-6 Chromaticity-7 (.305, .321) Figure 10.
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22 0.3 0.4 0.5 0.6 0.2 0.3 0.4 0.5 0.6 x y Chromaticity-0 Chromaticity-1 Chromaticity-2 Chromaticity-3 Chromaticity-4 Chromaticity-5 Chromaticity-6 Chromaticity-7 Spectral Locus Chromaticity-0 (0.430, 0.507) Chromaticity-1 (0.463, 0.481)
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23 markings (p<0.01) and horizon sky luminance (p=0.038)
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24 White P0 , 9 8.5 % P1 , 9 9% P2 , 9 9.3 % P3, 85% P4, 97.4% P5, 29.4% P6, 26.2%P7, 0.9% 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 x y Screen Gamut Transition Curve and Transition Points CIE 1931 Chromaticity Locus OH/DOT Proposed White FHWA Nighttime White FHWA Nighttime Yellow OH/DOT Proposed Yellow Virginia DOT-Drop On Thermo Nighttime FHWA Daytime Yellow FHWA Daytime White Figure 12. Yellow Response Percentages Overlaid on The CIE 1931 Chromaticity Diagram.
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25 White P0 , 9 8.5 % P1 , 9 9% P2 , 9 9.3 % P3, 85% P4, 97.4% P5, 29.4% P6, 26.2% P7, 0.9% 0.3 0.4 0.5 0.6 0.7 0.3 0.4 0.5 0.6 0.7 x y Screen Gamut Transition Curve and Transition Points CIE 1931 Chromaticity Locus OH/DOT Proposed White FHWA Nighttime White FHWA Nighttime Yellow OH/DOT Proposed Yellow Virginia DOT-Drop On Thermo Nighttime FHWA Daytime Yellow Figure 13. A Magnified View of the Yellow Response Percentages Overlaid on the CIE 1931 Chromaticity Diagram The between-subject variable "eccentricity" did not seem to generate a strong enough difference between yellow and white responses, and therefore is not a statistically significant factor.
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26 Table 3. Number of "yellow" and "white" responses for the variable "eccentricity".
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27 Pairwise comparisons between initial chromaticities showed that the only nonstatistically significant differences were found between chromaticity 0, chromaticity 1, and chromaticity 2. All other pairwise combinations of initial chromaticities proved statistically significantly different in affecting the response.
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