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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
  • Minimum Retroreflectivity Levels for Overhead Guide Signs and Street-Name Signs
  • Updated Minimum Retroreflectivity Levels for Traffic Signs
  • Impacts on State and Local Agencies
• 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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