LED Roadway Lighting: Impact on Driver Sleep Health and Alertness (2021) / Chapter Skim
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Pages 36-47
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From page 36... ...
36 Corneal Illuminance Dosage Experiment -- Naturalistic Driving Exposure Smart Road Exposure The results of the corneal illuminance dosage and irradiance for a 2-hour exposure in the lighted section of the roadway are shown in Table 8. The headlamps were always on, and the roadway luminance does not account for the additional luminance from the headlamps.
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Results 37 Light Condition Road Luminance (cd/m2) Total Dose (lux-s)
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38 LED Roadway Lighting: Impact on Driver Sleep Health and Alertness Division Functional Classification Avg. Luminance (cd/m2)
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Results 39 Experimental Conditions -- Corneal Illuminance Dosage Measurements Table 12 shows the total and average illuminance dosages from all the experimental conditions in the DSHA Experiment. The α-opic equivalent daylight illuminance values, calculated based on CIE S 026/E:2018, for each experimental condition are shown in Table 13.
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40 LED Roadway Lighting: Impact on Driver Sleep Health and Alertness Effect of Road Light Exposure on Melatonin The LMM results of the effects of light condition and time on salivary melatonin are presented in Table 15. Only the main effect of light condition was significant.
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Results 41 Effect Num DF Den DF F-Value P-Value Light Condition (LC)
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42 LED Roadway Lighting: Impact on Driver Sleep Health and Alertness the initial laps. However, as the number of laps increased, the detection distances became shorter until and beyond lap number 10.
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Results 43 LED–Medium and No-Light, and 4000 K LED–Low and No-Light, were also statistically significant (see Figure 15b)
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44 LED Roadway Lighting: Impact on Driver Sleep Health and Alertness Similar to the detection distances LMM, the post hoc pairwise comparisons of the two-way interaction between light condition and object color showed that differences between color recognition distances were statistically significant only for the red and yellow targets. For red targets, color recognition distances were statistically significant between 2100 K HPS–High and 4000 K LED–Low, and 2100 K HPS–High and no-light conditions (see Figure 17a)
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Results 45 0% 10% 20% 30% 40% 50% 1:00 AM 1:30 AM 2:00 AM 2:30 AM 3:00 AM Pe rc en ta ge o f E ye C lo su re Time 4000K LED–HIGH 2100K HPS–HIGH 4000K LED–MED 4000K LED–LOW No Light Figure 18. Effect of light condition on PERCLOS.
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46 LED Roadway Lighting: Impact on Driver Sleep Health and Alertness Effect of Road Light Exposure on Subjective Self-Reported Measure of Drowsiness (KSS) The LMM results of the effect of light condition and time on KSS are shown in Table 20.
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Results 47 A A B C C 1 2 3 4 5 6 7 8 9 12:30 AM 1:00 AM 1:30 AM 2:00 AM 2:30 AM 3:00 AM 3:30 AM Ka ro lin sk a Sl ee pi ne ss S ca le Time Figure 21. Effect of time on KSS.
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