Final answer:
Orange signs on the road indicate work zones, aiming to alert drivers to be cautious while approaching areas where roadwork is being carried out. They are designed to be highly visible in different lighting conditions. The color orange is also symbolic in various cultures but serves the purpose of safety in road signage.
Step-by-step explanation:
Signs that are colored orange are typically associated with work zones. They are used to alert drivers of upcoming construction or road maintenance projects and to help ensure the safety of both the workers and drivers passing through the area. Since orange is a color that is easy to see in different light conditions, it serves the purpose of catching a person's attention promptly.
Orange road signs are not to be confused with regulatory signs, which are usually white, school zone signs that are frequently yellow-green, or guide signs that are often blue or brown. As such, the correct answer to the question is 'a. Work zone signs.' Understanding the meaning of different colored signs is crucial for road safety and adherence to traffic laws.
Within Buddhist cultures, orange represents holiness due to its association with the robes of Buddhist monks, while in the Netherlands, it carries patriotic significance as the color of the royal family. Still, in the context of this specific question, the color orange on signs is firmly connected to work zone warnings.