本研究利用澳洲開發的TRARR 車流模擬模式，針對郊區二車道公路的禁止超車區，發展一系列不同道路幾何與交通特性下的跟車百分比變化曲線。使用者只需取得縱坡度、平曲線半徑等道路幾何資料，並決定改善路段沿線的雙向設計小時流量、方向分布、重車比率與期望跟車百分比 (服務水準) 等道路交通特性，即可應用本研究所建立的跟車百分比變化曲線獲得沿線超車道的建議設置位址、長度與間距。本研究所發展的超車道佈設方法，特性為使用簡單、適用於各種道路幾何與交通狀況，以及容易配合工程成本與工程可行性進行調整等，極具實務應用價值。

In this study, we developed practical guidelines for passing lanes under various geometric and traffic characteristics on no-passing zones of two-lane rural highways, whereby a series of car-following percentage curves were developed using the TRARR model. Road authorities can obtain the alternative location, lengths and spacing of passing lanes by applying the car-following percentage curves. The road geometric data that need to be collected include grades and curve radii. The traffic characteristics that need to be determined are the two-way design hourly volume, directional split, percentage of heavy vehicles and expected car-following percentage (level of service). The developed guidelines for passing lanes have the features of easy use and adaptability to various geometric and traffic conditions.