近年來道路除了在運輸規劃上要求永續，也逐漸在設計施工上要求以永續方法執行。本研究分析美國綠道路認證中，施工活動(construction activities)與環境相關指標之要求與文件，以美國和台灣各五個案例達成情形對照，參考地區環境與法規，分析指標達成之困難與原因，並透過實務訪談業主、設計/監造與承包商，確認在台灣使用綠道路指標會遭遇到的困難。
研究發現，美國案例在困難原因中，前端因素共占63%，過程因素占37%，九類原因中以經費時間最高(32%)，業主政策法規次之(20%)，而過程因素以資源技術(12%)為最高，施工及維護性(11%)次之。台灣案例困難原因總計前端因素占比例80%，過程因素僅占20%，其中前端因素以業主政策法規為最高(42%)，經費時間次之(28%)，過程因素以經驗不足(8%)和資源技術(8%)為最高，無準則規範困難。
施工活動困難原因，在美國和台灣都集中於前端因素，且以業主政策法規和經費時間為前兩名。而過程因素因地區不同而不同，美國以資源技術困難為最高，台灣則因為綠道路尚待發展，以經驗不足和資源技術最困難。
各施工活動環境相關指標，依據其執行困難程度、達成率的不同，可歸納整理出，指標難度以CA-5減少機具排放最高，達成率0。而相對難度低且達成率較高者，為PR-6廢棄物管理計畫、PR-7污染防治計畫、CA-2環保培訓、CA-3現場回收計畫、CA-7水的使用追蹤，於綠道路認證中施工活動環境相關指標，可由此五項優先執行。

In recent years, roads are gradually being asked to execute their design and construction in a sustainable manner. This research aims to analyze the requirements and documentation of the construction activities and environmental related indicators of the American Greenroads rating system. It also seeks to evaluate five roadway projects each in America and Taiwan, referencing regional environment and regulations, while also interviewing the owners, designers and contractors about the problems one would face when using Greenroads.
The study results show that of the difficulties the US projects faced, front-end factors accounted for 63% while the execution factor took up 37%. Of the nine difficulty reasons, cost and time was the highest (32%), with owner policy coming in second (20%). For the execution factor, resource technology was the highest (12%), with constructability and maintenability second (11%). For the Taiwan projects, front-end factors accounted for 80% while the execution factor took up 20%. Owner policy was the highest (42%) with cost and time second (28%), while the lack of experience (8%) and resource technology (8%) were both the highest.
Difficulty of construction activities concentrated in a project’s front end in both America and Taiwan. Furthermore, the top two factors are owner policy and cost and time. The execution factor varies from region to region, resource technology is most difficult in America. Taiwan’s green road system has yet to be developed, the most difficult factors are lack of experience and resource technology.
According to the different execution and achievement rates of construction activities, it can be summarized that the most difficult indicator is CA-5 equipment emission reduction, achievement rate is 0. While PR-6 waste management plan, PR-7 pollution prevention plan, CA-2 environmental training, CA-3 site recycling plan and CA-7 water use tracking are relatively easy. These indicators could be executed first in Greenroads.

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