Resource Materials
- Report : Methods for Maintaining Traffic Sign Retroreflectivity [HTML] [PDF - 683 KB]
- Brochure: Maintaining Traffic Sign Retroreflectivity - 2007 [HTML] [PDF - 198 KB]
- Sheeting Guide - [HTML, DOC, PDF 556 KB]
- FHWA Research on Minimum Sign Retroreflectivity Levels
- Workshops on Nighttime Visiblity of Traffic Signs: Summary of Workshop Findings
- Turner-Fairbank Photometric and Visibilty Laboratory
- Turner-Fairbank Safety Research
- Annotated Bibliography
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