省道快速公路出口匝道壅塞短期改善前後評估──以台65新莊二南下出口匝道為例

An Assessment of Expressway Interchange Exit Before and After Improvement -No.65 Expressway Xinzhuang 2nd Interchange Southbound Exit

省道快速公路提供快速交通服務，隨著都市發展，交通需求益增，原有出口匝道因配置及號誌管控關係產生交通瓶頸，本研究以台65新莊二南下出口匝道為例，該處銜接中正路（台1甲）係新莊地區重要幹道，尖峰時段平面道路車流量大，惟受限號誌時制，導致台65南下新莊二出口匝道車輛常於尖峰時間回堵（回堵長度約500公尺），影響台65主線車流運作，易造成交通安全問題。本研究以開設缺口讓右轉中正路車流提前匯出平面，配合號誌管制下匝道及平面車流方式進行匝道改善，並針對改善前後成效進行績效評估。

Expressways provides a path for fast-moving traffic, as the development of city increases traffic demand, the original design of the ramp and signal control has made the surface intersection become bottleneck.This research took No.65 Expressway Xinzhuang 2nd Interchange Southbound Exit as an example, the site locates at Xinzhuang 2nd Interchange Southbound Exit、Zhonghuan Rd、Zhongzheng Rd intersection, which connects the trunk road of Xinzhuang District with heavy traffic during peak hours, the original ramp design and signal control caused Xinzhuang 2nd Interchange Southbound Exit to have a spillback queue around 500 meters in length, this also affects expressway main-lane traffic and traffic safety.This research took opening the divisional island for vehicles which are taking right turn to Zhongzheng Rd from the ramp to merge into surface road earlier and adjusting current signal plan as ramp improvement strategy and evaluate traffic assessment of nearby traffic condition before and after the improvement.