In the United States, the underside of bridges and especially seat-type abutments are used as shelters by poor and homeless people. This usually is not a problem. When a bridge engineer needs to inspect a bridge, the residents are usually willing to temporarily move out of the way.
In folk tales, a villain, a troll, or even a monster might live under a bridge and prey upon unwitting travelers. This may have been a more successful occupation before people began traveling in fast-moving metal vehicles on well-maintained highways.
Shanghai, China's Bridges: Xizang Road Bridge (2) by Mark Yashinsky is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States License.
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