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From page 41...
... 41 Incremental Effects of Light Sources and Sign Sheeting on Legend Luminance for Overhead Guide Signs This appendix describes an analysis of the photometric data collected during the closed-course study described in Chapter 3. The purpose of the analysis is to identify the effects on legend luminance as a result of the type of sheeting, use of sign lighting, and presence of roadway lighting.
From page 42...
... 42 of legend luminance. An average was used because, at a typical mounting height for overhead signs, luminance from the top row of the legend is generally less than from the bottom row since the headlamp illumination decreases with greater height from the road.

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