When should reflective materials be used in work zone signage?

Reflective materials in work zone signage are crucial for ensuring visibility and safety, particularly during low-light conditions or at night. The use of reflective materials allows signs to be easily seen by drivers when natural lighting is limited, significantly decreasing the likelihood of accidents. This is especially important in work zones where drivers need to be alerted to changes in traffic patterns, speed limits, or other critical information that can affect their travel.

While reflective materials might be beneficial in various contexts, their primary purpose is to enhance visibility in situations where lighting is compromised. This emphasis on low-light or nighttime scenarios is why this option is considered correct. Reflective signage helps to ensure that warnings and instructions are effectively communicated to drivers, ultimately helping to protect both workers in the vicinity and the traveling public.