Retroreflectivity Maintenance
Expected Sign Life Method
In this method, individual signs are replaced before they reach the end of their expected service life. The expected service life is based on the time required for the retroreflective material to degrade to the minimum retroreflectivity levels. The following factors provide additional information about using this method:
- The expected service life of a sign can be based on several different sources of information, such as:
- Sign sheeting warranties.
- Sign test deck measurements.
- Measurements of actual signs.
- An agency will need a method of identifying the age of individual signs. Potential methods include:
- A sticker or other label attached to the sign that identifies the year of fabrication, installation, or replacement.
- A sign management system that can identify the age of individual signs.