Signs are considered essential to communicating regulatory, warning, and guidance information. It is critical that signs are able to fulfill this role during both daytime and nighttime periods. The ability of a sign to fulfill its role during nighttime periods is provided by a unique form of reflection known as "retroreflectivity." Various methods can be used within an agency's sign management processes to meet and maintain a minimum retroreflectivity requirement for traffic signs.
This course will review retroreflectivity requirements and the MUTCD, as well as give basic sign types and obstructions to understand retroreflectivity.