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2. Corrosion Resistance High-quality metal covers, especially those made from stainless steel, are resistant to corrosion. This characteristic is particularly crucial in areas exposed to chemicals, salts, or harsh weather. Corrosion can significantly weaken a drainage system, leading to costly repairs and potential hazards.

The utilization of manhole covers as street art has also been done in Taiwan and Vietnam.

Manholes are generally found in urban areas,^[2] in streets and occasionally under sidewalks. In rural and undeveloped areas, services such as telephone and electricity are usually carried on utility poles or even pylons rather than underground.