圓環是臺灣都市歷史上不可忽略的一環，在都市中是一個可供指認的節點(Nodes)，但臺灣的圓環在歷經都市成長的過程而逐漸消失。從日治時期開始，圓環的概念被日人從西方引入，作為威權統治、殖民的象徵。自西元1970年代隨著都市交通量增加，圓環紓解交通的功能備受考驗。隨著都市發展，人口與機動車數量增加，圓環逐一被拆除，失去作為都市節點的凝聚力。
為了回應上述臺灣圓環所面臨到的問題，本研究欲探討臺灣圓環經歷都市發展後被保留與否的因素，能作為未來新設圓環之設計與既有圓環之建議。以不同於過往單就交通方面的研究與政策判斷之角度切入，解析圓環存廢與否之現象與原因，不僅包含常見的交通觀點，還加入如區位、型態等面向的考量。
本研究分為兩個階段，第一階段研究為圓環屬性分析，以套疊歷史圖資的方式，觀察臺灣圓環的變化並盤點屬性資料，分別以型態層面、交通層面、區位層面與時間層面進行分類。而後第二階段研究為圓環變遷模型分析，將針對具有時間脈絡的變數進行探討，以空間型構法觀察圓環自日治時期至今的在都市路網中的轉變，之後將空間型構法得出的指標與人口數、機動車輛登記數等變數建構圓環是否保留的羅吉斯迴歸模型，以模型的方式了解這些變數對圓環影響的顯著性與影響程度。
研究結果顯示人口數、機動車輛登記數、空間型構法指標、交會道路層級、交會道路數量、路寬、圓環大小、土地使用分區等，皆為重要影響圓環是否保留的因素。並且不同的都市規劃手法也會影響圓環的轉變，如格子狀的街道設計較不適合設置圓環，放射狀的街道設計更為合適設置圓環也更容易讓臺灣圓環保存。最後以研究結果將圓環分類並建議該路口設置圓環是否具有優勢，並與實際狀況比較差異與原因。

The roundabout is a node that can be identified in the city. However, with urban development, the number of people and vehicles increased, the roundabouts were dismantled one by one, losing their cohesiveness as urban nodes. To respond to the problems mentioned above, this study aims to explore the factors of whether the Taiwan roundabout will be retained or not after the urban development. To understand the factors of the transformation of the Taiwan roundabouts, which can be used for future design of new roundabouts and suggestions for the existing roundabouts. This study is divided into two stages. Firstly, overlays the historical maps and inventories the attributes of the roundabouts in Taiwan. Then, through literature review, the factors that may affect the change of the roundabout were obtained. Using the cross-analysis method to preliminarily understand how the factors influence each other and lead to the retention of the roundabout. Secondly, building the binary logistic regression model to explain how the factors affect roundabouts in Taiwan. Finally, according to the research results, we classify the roundabouts and suggest whether there is an advantage to set up the roundabouts at the intersection and compare the difference with the actual situation and the research results.

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