永續議題近年影響各產業，使其紛紛將環境永續的觀念納入產品開發，製造業開始較早，回顧相關永續文獻，都以製造業為對象居多。營建工程由各產業產品組成，公路工程占營建業很大的比重，其施工範圍大，使用的材料也多，若從公路著手永續，對環境效益將有不小的提升。

生態設計(EcoDesign, ED)是產品設計時考量全生命週期對環境的影響。本研究參考、調整製造業ED策略，轉換成公路設計可採用的永續設計策略。首先問卷調查營建業，了解規劃、設計階段以業主及顧問公司最能著力永續。回顧以規劃、設計為主的公路研究，由文獻找出公路設計的永續項目共75項，包含至11個專業中，代表公路考量的永續作法，而各項目有定義，可與涵義相近的ED策略連結。

研究結果得出，公路以策略2「減少量體」與5「減少使用階段影響」為主要考量，再蒐集於設計階段將永續納入工程中的五個公路案例，得出策略2.1「減少材料使用」、5.2「使用潔淨耗材/能源」、5.4「減少環境改變」為公路較為適用的ED子策略，後續若設計公路永續，可先著手此三個子策略。

此外，永續納入工程最有可能遇到業主政策法規、自然條件限制。提醒設計者若設計永續公路會受限政策、法規，若政府不積極作為，永續設計不容易執行。

Sustainability issues have affected industries causing its concept to be integrated into product development, such as in the manufacturing industry. Construction projects involve many industries and roadway construction includes a large portion of manufactured products. If sustainable materials are used from the start of a roadway construction, the environmental benefits are large.

Eco Design (ED) is the product life cycle design that considers the environmental impacts. This study referenced and adjusted manufacturing ED strategies for the roadway sustainable design. The questionnaire survey revealed that owners and consultants play the major role in sustainable design. Literature review of planning and design of roadway identified a total of 75 sustainable items, belonging to 11 disciplines. The items can define a sustainable approach that is linked with the ED.

From the results obtained, strategies 2 (Reduction in weight/volume) and 5 (Reduction of impact during use) are more adequate for roadway projects. In this five roadway design case projects, their sub-categories 2.1 (Reduce materials use), 5.2 (Use cleaner consumption/energy), and 5.4 (Reduction of environmental change) were more specific and applicable ED strategies.

Sustainable design always faces and requires the consideration of project owners’ policies and regulation, and the limitations of the natural conditions. Sustainable roadway designers are reminded that they will be limited by policies and regulations if the government is not actively involved in sustainable design.

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