工程需要考量永續性議題，現階段永續目標已指向基礎建設，而道路工程是最主要的基礎建設，其工程跨度長，涉及環境面向多，因而更應納入永續考量。
本研究以綠道路評估系統為對象，研究指標之分數與環境衝擊之相稱性，並評估指標分數的合理性。分析施工活動、材料與資源、鋪面技術三個領域共20個指標。先對其分類，分為僅相關書面計畫或報告記錄之文書類、效益類指標，根據指標目標與要求，分析指標牽涉的生命週期階段，蒐集指標例，計算排碳量，比較指標例之分數與排碳量的相稱性，並依據生命週期排碳量設置環境衝擊權重，比較指標分散。
以MR-4回收材料為例，分析美國公路回收瀝青和道路回收水泥混凝土2個案例，發現案例的分數與回收材料所占百分比有直接關係，但每平方米碳排放量卻相差甚大，例1、例2為0.86 kgCO2e/m2 和150 kgCO2e/m2，例2是例1碳排的174倍，得分卻是3倍。以MR-5區域材料為例，例1使用70%區域材料減少22 kgCO2e/m2 得1分，例2使用97%區域材料減少1kgCO2e/m2 得4分，指標分數與指標案例之減碳量不相稱。
材料使用類3個指標碳排放之分數與綠道路指標分數5分尚無明顯差異，其中材料生產平均分數5最大，回收1最小；能源消耗類指標生命週期平均分數為1；廢棄物排放類3個指標僅牽涉施工階段，平均分數為2。
研究結果表明，指標之碳排放量與指標分數關係不明顯。生命週期之分析顯示，涉及材料生產與材料運輸階段之指標，對環境衝擊較大，所得分數較高。有2個減少碳排之指標，能較少環境衝擊，但分數較低。

Sustainable development objectives are pointing to infrastructure nowadays, and in terms the most important infrastructure, roadways should be included in sustainable development considerations.

The research chose the Greenroads rating system to investigate the proportionality of the indicator scores and the environmental impacts to assess the reasonableness of the indicator scores. In total, 20 indicators were analyzed in three categories including construction activities, materials and resources, and pavement technology.

The indicators were classified into those related to documents (human benefit), and environmental impacts. Then the involved life cycle stages of the indicators were analyzed according to the indicator’s objectives and requirements. Furthermore, the indicators from cases were collected and CO2 emissions calculated. Finally, the indicator scores and CO2 emissions were compared.

In the case of MR-4 recycled materials, CO2 emissions of examples 1 and 2 are individually 0.86 kgCO2e /m2 and 150 kgCO2e/ m2. The latter is 174 times larger than the former, but its score is only three times former; for MR-5 regional materials, example 1 reduces 19 kgCO2e /m2, scoring 1 point; and example 2 reduces 1.2 kgCO2e/m2, scoring 4 points. The amounts of carbon reduction and indicator scores are not compatitble.

The results show that no significant relationships exist between the CO2 emissions of the indicators and their scores. The analysis of life cycle shows that indicators involving material production and transport make a greater impact on the environment and result in higher scores.

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