應用SES模式於西濱快速公路交通控制改善之研究

A Study of Traffic Control Improvements for Sibin Expressway U sing SES Model

本研究針對西演快速公路之現況問題進行了解，發現存在交叉路口之設計不良、超速車輛之執法問題、行人穿越之安全問題及號誌時制設計不當等問題，其中又以號誌控制問題最為嚴重，因此特別針對西演現行交通控制問題，研擬改善對策。本研究以現場蒐集的車流特性為基礎，考量平均總延滯時間作為決定時制的評估指標，應用號誌化快速公路模擬(SES)模式進行模擬分析，探討在不同流率、不同週期下之國定假日及平常日的號誌時制方案。經以路口間距作為群組劃分依據，將交叉路口分類成獨立路口系統與兩鄰近路口系統。經本研究之分析，新的時制計畫與現況時制相比，獨立路口的延滯改善程度可達6.5%~11.5%'兩鄰近路口的延滯改善程度可達7.0%~18.0%。

This paper analyzed Taiwan West Coastal (i.e. , Sibin) Expressway, a special type of expressway designed with signalized intersections, and identified issues and causes result in its traffic management problem. Those causes include improper intersection design, inadequate enforcement, pedestrian safety design, and improper signal time plan. Among them, the improper signal time plan is the most significant problem that degrades the efficiency of Sibin Expressway. Based on traffic characteristics collected Irom field investigations, this study uses Signalized Expressway Simulation (SES) Model to analyze performance of intersection on the northern section of Sibin. Average Total Delay (ATD) of intersections is chosen as the measure of intersection effectiveness. Intersections were grouped into isolation intersection and two-neighboring intersections according to spacing between each other. Time plans under different flow rates and cycle lengths of different time olweekdays and holidays were evaluated using SES model and best practice time plans were suggested. After applying best practice signal plans, the reduced ATD lor Sibin in independent intersection is among 6.5%~11.5 %, and in two-neighboring intersections 7.0~18.0 %， compared to original designs.