What do I have to do to meet the sign retroreflectivity standard that goes into effect on June 13, 2014?

Geoff Scott demonstrating the use of transparency film comparison panels on a stop sign

An agency just needs to implement an assessment or management method to maintain sign retroreflectivity by June 14. The standard says:

Implementation and continued use of an assessment or management method that is designed to maintain regulatory and warning sign retroreflectivity at or above the established minimum levels.

The Cornell Local Roads Program has a series of Tech Tips on how to meet the retroreflectivity standards including sheets on the five approved methods:

Maintaining Sign Retroreflectivity

Signs are replaced as per the method chosen.

Resources

MUTCD

Maintaining Sign Retroreflectivity

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This work by the Cornell Local Roads Program (CLRP) is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License.