本文係一個臺北市之單行道系統規劃實例，文中為使規劃之單行道系統能符合當地之路網與交通特性，本文依為解決局部問題而設置之現行單行道系統，將研究區域分為四個分區，按各分區之特性，列舉其所有可行方案，並以一簡易之交通量分派方法，評估各方案對道路交通負荷之影響，最後取各分區中對道路交通有最大正效益之方案組成三個綜合方案，再以其對整個研究區域道路負荷之影響、對駕駛人之影響、其實施之阻礙性、對路邊商店之影響四項因素評估其優劣，選擇最佳者訂為建議方案。

This paper is a case study of one-way-system planning in Taipei. For the purpose of reconciling the planned one-way-system with the characteristics of local road network and traffic, the study area is divided, according to the scopes of current one-way-systems, into four subareas. From each subarea’s characteristics, all the feasible one-way-system plans are listed and a simplified traffic assignment method is developed to evaluate the impact of every planned system on traffic load. Then this paper picks the plans with the higher positive effect on road traffic in each subarea to make up three integrated plans. Using four indices: the influence on the traffic load of the whole study area, the influence on the driver’s performance, the impedance to realize it, and the influence on the business of roadside shops, it evaluates their priorities and selects the first as the suggested plan.