外環捷運路網市場服務範圍與路線評估之研究

THE STUDY ON MARKET AREAS AND ROUTE EVALUATION OF SUBURBAN RAPID TRANSIT NETWORKS

本研究針對都會區外圍跨區通勤旅運問題，嘗試分析外環式捷運系統與主幹線輻射式捷運系統整合之可行性並深入探討整體系統之效益與衝擊，期規劃各個跨區適當的外環式捷運系統組合以助於改善郊區跨區通勤擁擠問題，提升整體運輸系統績效。本研究應用連續近似方法先將研究範圍切割為一萬格之數值網格，以一般化總旅行成本最小為依據，對迄點為各重要旅次吸引點之各數值網格內旅運者，進行最佳旅運運具與路線選擇之指派，以求得外環式捷運線之市場服務範圍，並進一步考量空間與時間價值變異特性來總計外環式捷運線之服務旅運需求量，以構建供需均衡模式，評估外環式捷運系統之路網位置與長度。供需均衡模式乃權衡取捨路線建造成本、車隊擁有成本、營運成本與使用者節省之一般化總旅行成本之關係，以評估外環式捷運系統之路網位置與長度。最後，以大台北都會區之捷運路網為例來進行一實例研究，以闡述本研究模式之應用。研究結果除了可提供規劃者興建捷運路網位置之機制決策參考外，亦可提供不同起迄需求與時間價值旅運者之最佳旅運運具與路線組合之資訊決策參考。

This study is to be directed towards the cross-commuting problem among suburban centers and analyzing the feasibility of integrating the suburban rapid transit (SRT) and the radial rapid transit (RRT). Hopefully, it is aimed at making a suitable plan about how to combine the SRT and RRT to solve the cross-commuting problem and to enhance the effectiveness of the whole transportation system. A continuum approximation technique is proposed to divide the study region into 10,000 arithmetic grids and assign travelers’ optimal access mode and route choices by minimizing their generalized total travel costs. Furthermore, the study considers variations in commuters’ values of time and residential locations to aggregate the passenger’s demand of the SRT. Then, generalized total commuters’ saved travel cost, SRT construction costs, SRT operating costs and SRT vehicle acquisition costs, are formulated to construct a demand-supply interaction model to evaluate the route of the SRT. Finally, an example of Taipei metropolitan corridors for rail rapid transit is used to illustrate the application of the model in this study. The results can be used as guidelines on determining the optimal route selection for SRT planners, the optimal access mode and route decisions for travelers.