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Retroreflectivity References

The following links provide supplementary information about Ra inspections.

  • Sign Retroreflectivity Implementation Tools by U.S. Department of Transportation Federal Highway Administration
  • Reflectivity by 3M. This document explains how we see and the differences in types of reflectivity, reflection, and retroreflection.
  • MUTCD Language by U.S. Department of Transportation Federal Highway Administration

 

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