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为了评价潜在标志区视觉的复杂性，已研究出一种实用的现场评估办法。当某些地方标志质量恶化后，该法可用于帮助决定采用何类定向反射材料来替代。
In order to assess the visual complexity of the potential landmark area, a practical on-site assessment has been developed. The law can be used to help decide which type of retroreflective material to replace when the quality of signs in some places deteriorates.