臺北市公車近幾年一直面臨乘客大量流失的狀況，為求有效解決臺北市公車營運 困境，改善都市交通擁擠，交通部運輸研究所於民國八十四年一月研擬臺北市棋盤式幹線便 捷公車示範計劃，該棋盤式公車路網之量化效益如何，在該報告書中並未詳予評估。因此， 本研究的最主要目的即在於評估與比較棋盤式公車路網與現況公車路網之量化效益。本研究 屬於事前及總體性的效益推估，評估準則共包含六項指標，分別為使用者方面的平均旅行時 間、平均旅行成本； 業者方面的每班次平均週轉期間；及管制者 (政府 ) 方面的相對彎繞 度指標、 路網密度指標、 公車系統總成本。 由於實際路網非常複雜， 需藉由套裝軟體 TRANPLAN 來模擬真實狀況，輸入路網資料，進行交通量指派工作， 並將其部份輸出結果， 經由整理、計算成為路網之評估指標。最後結果顯示，在六項指標中，棋盤式公車路網皆優 於現況公車路網，表示棋盤式公車路網值得採行。

　　　　　While bus system is one of the major transit systems in Taipei city, it is now facing a serious decrease in passengers. In order to improve the bus operations and traffic congestion in Taipei, the Institute of Transportation, Ministry of Transportation and Communications has planned a grid bus network in January 1995. However, the quantitative performance of this grid bus network hasn't been evaluated in that plan. The main purpose of this study is to evaluate and compare the benefits between grid bus network and present bus network. This study is a "before and macro" type evaluation. Six evaluation indices are chosen and can be divided into three groups: 1. User: average travel time, average travel cost, 2. Operator: average turnover time and 3. Regulator (government): circuity of network, density of network, total cost of bus system. Due to complication of the real network, this study simulates the Taipei case by the package of TRANPLAN. It is concluded from the case study that grid bus network is better and worth pursuing.