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Methods to Assess and Manage Retroreflectivity
Five maintenance methods are available to assess and manage minimum retroreflectivity levels for traffic signs: (1) visual nighttime inspections (using calibrated signs, etc.), (2) actual sign retroreflectivity levels measured using a retroreflectometer, (3) replacement based on individual sign life, (4) blanket replacement of all signs in an area, and (5) use of a sampling of control signs that represent field signs. These methods can be used alone or in combination and allow for a wide range of options for an agency to adapt them to their current sign management processes given the technical ability of their staff.
- Improving Traffic Sign Management Process
- Brochure: Maintaining Traffic Sign Retroreflectivity (2007 Edition) [HTML] [PDF - 198KB]
- Report : Methods for Maintaining Traffic Sign Retroreflectivity [HTML] [PDF - 683 KB]
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