[問題] 高架橋的材質
最近常座客運來回中壢台北
發現五楊高架橋的路面底基(不知道該怎麼稱呼)
就是路面下方的那一部分
常會有一段是鋼筋水泥一段又是鋼材
然後從林口交流道到泰山收費站全都變成鋼性材質
請問是因為地理位置的不同還是承包商不同才會變成這樣阿?
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