U.S. Department of Transportation
Federal Highway Administration
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Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
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Publication Number: FHWA-HRT-04-149
Date: December 2005
Enhanced Night Visibility Volume XVIII Overview of III
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The Phase III research indicated that supplemental IR shows promise for significantly increasing detection of pedestrians; however, for the system to be successful, the implementation of the technology is extremely important. The NIR systems showed promise for increasing visibility in rain conditions. This technology potentially could improve visibility in other inclement weather conditions, although such scenarios were not specifically tested. Both types of IR systems also showed promise in overcoming age-related decrements in visibility.
The disability glare study indicated that headlamps that were rated as discomforting were also associated with more disability glare. It also showed that beam intensity is a better predictor of both disability glare and discomfort glare than beam pattern.