When is the replacement of WZRPMs required?

The replacement of WZRPMs (Work Zone Reflective Pavement Markers) is required primarily when they are considered to have failed. This means that if the markers are not functioning as intended—such as when their visibility is significantly reduced or they no longer reflect light adequately—they must be replaced to ensure safety and effective traffic guidance. Failing to replace them can compromise the safety of both workers and drivers in a work zone, as these markers play a critical role in delineating the road and providing necessary information about ongoing construction or maintenance activities.

Other factors such as being outdated, discolored, or changes due to seasonal effects may reduce the effectiveness of WZRPMs, but they do not directly necessitate replacement unless the function is impaired. The focus on functional failure emphasizes the need for these devices to operate correctly in guiding traffic safely through work zones.