U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
|This report is an archived publication and may contain dated technical, contact, and link information|
Publication Number: FHWA-HRT-04-144
Date: December 2005
Enhanced Night Visibility Series, Volume XIII: Phase III—Study 1: Comparison of Near Infrared, Far Infrared, High Intensity Discharge, and Halogen Headlamps on Object Detection in Nighttime Clear Weather
PDF Version (1.01 MB)
PDF files can be viewed with the Acrobat® Reader®
APPENDIX F—BRIGHTNESS SETTINGS
For comparison of brightness settings across the different age groups, instrument panel (IP) (dashboard) brightness settings in the vehicles were recorded using the control setting selected by the participants. Absolute measures of brightness for the different vehicle and systems were not collected. Measures were made by dividing the range of each vehicle’s IP physical adjustment range approximately into eighths. The final position of the control as set by the participant was recorded within this range. Due to different controls in each vehicle, only the settings for SUV 3 are used here for comparison of IP brightness across the age groups. Figure 82 indicates the mean setting of the IP brightness control and standard error for each of the age groups.
Figure 82. Bar graph. Instrument Panel brightness setting by age group (headlamp VESs only).
Similarly, in-vehicle display brightness settings were recorded by dividing each vehicle’s in-vehicle display physical adjustment range approximately into eighths. The final position of the control within this range- as set by the participant was recorded. Figure 83 indicates the mean in-vehicle display brightness setting and standard error for each of the age groups in each vehicle. Due to different controls in each vehicle and different gain on the controls, comparison is not possible from vehicle to vehicle.
Figure 83. Bar graph. VES by Age interaction for display brightness setting.