What color indicates a temporary road closure sign?

The correct answer is orange, as this color is universally recognized for indicating temporary road conditions, including closures, construction work, or detours. Using orange for temporary road closure signs helps ensure that drivers pay attention to the information being conveyed, as it signifies caution and alerts them to potential hazards or changes in the roadway.

In contrast, blue is typically used for informational signs such as those indicating services, green is often associated with directional signs that provide guidance, and red is generally reserved for regulatory signs that indicate stops or prohibitions. Therefore, orange is specifically chosen for temporary or transitional conditions on the road to enhance safety and awareness among drivers.