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When highway engineers build road in a mountainous area they inserted drainage pipes into the slopes alongside the road-why?
Wiki User
∙ 9y ago
The drainage pipes are to prevent the road surface cracking by keeping the ground near the road dry. When the ground underneath the road gets wet, the road could sink, kind of like when you walk in a swamp. If only part of the road sinks and the rest stays in the same place, the road could crack where the sunken portion of the road meets the part that hasn't sunk.
Wiki User
∙ 9y ago
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