Retroreflectivity Maintenance
Comparison Panels Procedure
Small comparison panels are used to assess the retroreflectivity of questionable signs. The comparison panels are fabricated at retroreflectivity levels that are at or above the minimum levels. When the retroreflectivity of a sign is considered to be questionable, a comparison panel is attached to the sign and the sign/panel combination is viewed by the inspector. If the comparison panel appears brighter than the sign, the sign needs to be replaced.
Comparison Panels Procedure Checklist
- Be well rested
- Select inspection vehicle and have headlamps aimed
- Select inspection routes (both directions)
- Prepare inspection forms
- Have sign list if available (for each inspection route, a list of signs you expect to see, in order of the direction of travel)
- Clip board, pen lights, dash cam, tape recorder, laptop
- Cannot start in earnest until complete darkness
- View calibration signs before starting your inspection routes