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Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations

Report
This report is an archived publication and may contain dated technical, contact, and link information
Publication Number: FHWA-HRT-04-145
Date: December 2005

Enhanced Night Visibility Series, Volume XIV: Phase III—Study 2: Comparison of Near Infrared, Far Infrared, and Halogen Headlamps on Object Detection in Nighttime Rain

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APPENDIX I—RESULTS ANOVA TABLES

Table 15. ANOVA table for discomfort glare results.
Source DF SS MS F Value P Value  
ADJUSTED TOTALS 299 1302.9       
Between
Age 2 42.5 21.2 0.92 0.4112  
Participant (Age) 27 624.3 23.1     
 
Within
VES 4 143.6 35.9 14.36 <.0001 *
VES by Age 8 32.9 4.1 1.65 0.1199  
VES by Participant (Age) 108 270.0 2.5     
 
Adaptation 1 0.6 0.6 0.22 0.6466  
Adaptation by Age 2 3.2 1.6 0.61 0.5496  
Adaptation by Participant (Age) 27 70.7 2.6     
 
VES by Adaptation 4 0.8 0.2 0.19 0.9424  
VES by Adaptation by Age 8 8.0 1.0 1.02 0.4254  
VES by Adaptation by Participant (Age) 108 106.2 1.0     

  * p < 0.05 (significant)


Table 16. ANOVA table for the objective measurement of disability glare with detection distances.
Source DF SS MS F Value P Value  
ADJUSTED TOTALS 598 16036520.3       
Between
Age 2 1768349.8 884174.9 15.92 <.0001 *
Participant (Age) 27 1499180.6 55525.2     
 
Within
VES 4 1541883.0 385470.7 26.89 <.0001 *
VES by Age 8 175486.4 21935.8 1.53 0.155  
VES by Participant (Age) 108 1547940.8 14332.8     
 
Adaptation 1 8474.2 8474.2 0.66 0.4235  
Adaptation by Age 2 48880.7 24440.3 1.91 0.1683  
Adaptation by Participant (Age) 27 346393.3 12829.4     
 
Pedestrian 1 4864076.3 4864076.3 86.11 <.0001 *
Pedestrian by Age 2 47114.7 23557.4 0.42 0.6632  
Pedestrian by Participant (Age) 27 1525224.5 56489.8     
 
VES by Adaptation 4 4099.3 1024.8 0.17 0.9524  
VES by Adaptation by Age 8 39558.4 4944.8 0.83 0.5794  
VES by Adaptation by Participant (Age) 108 644631.6 5968.8     
 
Pedestrian by VES 4 268031.5 67007.9 10.18 <.0001 *
Pedestrian by VES by Age 8 24537.8 3067.2 0.47 0.8776  
Pedestrian by VES by Participant (Age) 108 710820.4 6581.7     
 
Pedestrian by Adaptation 1 16062.1 16062.1 2.66 0.1143 *
Pedestrian by Adaptation by Age 2 18858.3 9429.1 1.56 0.2278  
Pedestrian by Adaptation by Participant (Age) 27 162826.8 6030.6     
 
Pedestrian by VES by Adaptation 4 13723.3 3430.8 0.55 0.7011  
Pedestrian by VES by Adaptation by Age 8 16110.7 2013.8 0.32 0.9563  
Pedestrian VES by Adaptation by Participant (Age) 107 670372.6 6265.2     

  * p < 0.05 (significant)


Table 17. ANOVA table for the objective measurement of driver’s eye illuminance.
Source DF SS MS F Value P Value  
ADJUSTED TOTALS 599 1610.72       
Between
Age 2 103.27 51.64 11.83 0.0002 *
Participant (Age) 27 117.85 4.36     
 
Within
VES 4 187.68 46.92 16.26 <.0001 *
VES by Age 8 131.67 16.46 5.7 <.0001 *
VES by Participant (Age) 108 311.64 2.89     
 
Pedestrian 1 87.62 87.62 39.24 <.0001 *
Pedestrian by Age 2 26.79 13.40 6 0.007 *
Pedestrian by Participant (Age) 27 60.29 2.23     
 
Pedestrian by VES 4 81.59 20.40 12.4 <.0001 *
Pedestrian by VES by Age 8 101.92 12.74 7.75 <.0001 *
Pedestrian by VES by Participant (Age) 108 177.58 1.64     
 
Adaptation 1 0.20 0.20 0.39 0.5355 
Adaptation by Age 2 0.15 0.08 0.15 0.8647 
Adaptation by Participant (Age) 27 14.00 0.52     
 
VES by Adaptation 4 1.34 0.34 0.34 0.848  
VES by Adaptation by Age 8 2.07 0.26 0.26 0.976  
VES by Adaptation by Participant (Age) 108 105.66 0.98     
 
Pedestrian by Adaptation 1 0.06 0.06 0.13 0.7231  
Pedestrian by Adaptation by Age 2 0.30 0.15 0.3 0.7428  
Pedestrian by Adaptation by Participant (Age) 27 13.54 0.50     
 
Pedestrian by VES by Adaptation 4 2.82 0.71 0.98 0.4196  
Pedestrian by VES by Adaptation by Age 8 5.27 0.66 0.92 0.5038  
Pedestrian VES by Adaptation by Participant (Age) 108 77.40 0.72     

  * p < 0.05 (significant)

 

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