For signs used during nighttime construction, which type of material is preferred?

The preferred choice for signs used during nighttime construction is reflective materials. Reflective materials are specifically designed to enhance visibility in low-light conditions, making them ideal for nighttime use. When headlights from vehicles shine on these signs, the reflective surface bounces back a significant amount of light, ensuring that drivers can see the signs clearly even in dark environments. This is crucial for maintaining safety and effective communication of important information to motorists during construction activities.

Reflective materials help to reduce the likelihood of accidents by ensuring that signs are noticeable and legible. This characteristic of enhanced visibility is particularly important in construction zones where generating awareness about detours, road conditions, and other hazards is critical to ensuring the safety of both the construction workers and the traveling public.