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The three-phase Enhanced Night Visibility (ENV) project studied the potential for implementing supplemental ultraviolet A (UV–A) headlamps and supporting infrastructure to improve onroad night visibility. Phase I of the project is detailed in ENV Volume II, Overview of Phase I and Development of Phase II Experimental Plan. The focus of the Phase I effort was on the establishment of performance and design objectives to facilitate the deployment of UV–A headlamps. Phase II of the project included the initial studies that were conducted to support the establishment of these performance and design objectives. The marginal performance benefits of the UV–A headlamps found in Phase II dictated a change in direction for the Phase III portion of this research. This report provides an overview of the studies accomplished in Phase II and the experimental plan that was developed for Phase III.
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