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Maintaining Sign Retroreflectivity: Visual Nighttime Inspection

The Visual Inspection Assessment method, also referred to as the Visual Nighttime Inspection method, is when on-the-fly assessments of retroreflectivity are made by an inspector during nighttime conditions. [1] The visual inspection method is likely to be the most practical method for smaller agencies with limited resources to comply with the
maintenance requirements of the MUTCD.

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