鑑於氣候變遷造成地球暖化，2050年達成淨零碳排成為全球努力目標，近年已有許多工程減碳的研究，道路工程也不例外。然計算碳排過程繁瑣且耗時，而工程金額是所有工程都會有的資訊，若能找出金額與碳排間的關係，或能以其推估出工程碳排。
本研究蒐集22個道路工程案例，分析其金額與碳排的相關性。了解碳排的計算方法，訂定計算邊界，將案例的工程金額以全部材料、前10及前20項材料、大工項及材料工項、新建或整建、直接或間接工程、道路類型、工項數等，以迴歸分析及Spearman等級相關性計算案例各種金額與碳排的相關性，分析相關性高低，最後提出相關性公式。
彙整22個案例相關性計算，得出結果如下，工程金額與碳排相關性為0.99，公式為y=40.451x-2126.8，以工程金額代入x推估工程碳排y；全部材料金額與工程碳排相關性0.99，公式為y= 48.619x-3530.1，材料金額平均占工程金額83%，算出後除83%及為推估的工程碳排；前10項材料金額相關性0.99，公式y = 46.645x - 1664.6，金額占比63%；前20項材料金額相關性0.99，公式y = 46.443x-1978.1，金額占比69%，工程金額、材料金額與碳排相關性高，可以此推估工程碳排。
其他類別工項、種類金額與碳排相關性分別為，道路工程0.94、排水工程0.94、擋土牆及護坡工程0.80、橋梁工程0.99、混凝土0.99、鋼筋0.91、瀝青混凝土0.97、碎石0.95、新建道路0.99、直接工程0.99、單位碳排面積0.41、一般道路0.99。間接(假設)工程、整建道路、高速公路、工項數碳排的相關性中高，可搭配前述材料與碳排相關性，推估整體工程的碳排放。

This study investigates the correlation between the costs and carbon emissions of roadway construction projects. Since calculating carbon emissions is a complex and time-consuming process and costs are available for all projects, identifying the relationships between costs and carbon emissions could enable to estimate carbon emissions based on project costs.
The study collected data from 22 roadway cases and analyzed the correlation between various costs—such as total material, top 10 and top 20 materials, categories and work items, new construction or reconstruction, direct or indirect construction, road types, and the number of work items—and carbon emissions using regression analysis and Spearman rank correlation.
The results show a correlation of 0.99 between project costs and carbon emissions. The correlation between total material costs and carbon emissions is 0.99, with material costs averaging 83% of total project costs. The top 10 material costs show a correlation of 0.99, representing 63% of the total cost, while the top 20 material costs have a correlation of 0.99, representing 69% of the total cost. By category, the correlations between project costs and carbon emissions are 0.94 for road work, 0.94 for drainage work, 0.80 for retaining walls and slope protection, and 0.99 for bridge. For material costs and emission, the correlations are 0.99 for concrete, 0.91 for steel, 0.97 for asphalt concrete, and 0.95 for gravel. New roadway construction shows a higher correlation than reconstruction, and direct construction shows a higher correlation than indirect one.
These correlations, derived through regression analyses, allow for the estimation of carbon emissions of an overall project or specific work items based on the derived regression formula.

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