本研以國內現實存在的步道(人行道和騎樓)，來進行調查分析，並依據行人通行於步道的位置，將其分成兩方面來考慮：一者以交通流理論先了解行人的交通量與步道寬度的關係。繼而以Erlang distribution之行人到達分佈中的「位相」來判別服務水準，並可求出步道寬度與行人交通量的關係；另一則由「行人本身之佔有空間」來求其「最小步道寬度」，再由VTR帢驗來驗證所求出的最小寬度。最後，比較兩者中之較大者(取充裕者)以做為步道的設計寬度。

　　　　　There are two considerations to design the width of sidewalks in this paper. One is to apply pedestrian volume and level of service to decide the width of sidewalks. The relationship between pedestrian volume and the width of sidewalks can be clarified by the traffic flow theory. The phase of Erlang distribution obtained by pedestrian arrival distribution can represent level of service. The other is use "pedestrian occupancy space" to calculate the minimum width of sidewalks verified by the VTR experiment. Finally, the larger should be the designing width of sidewalks.