一直以來，國道1號為西部走廊的交通大動脈，因此在上、下午尖峰時段，進入及離開高速公路主線的車流增加，而導致在都會區之出口匝道產生壅塞。當車流回堵至主線，不僅影響主線車流行駛速度更是對於主線車流產生安全疑慮。造成出口匝道壅塞之原因為到達車流量大於紓解之車流量，一旦無法即時紓解等候車隊，就會造成車輛回堵，且回堵長度超過減速車道長度時，便會佔據主線外車道。因此，本研究希望能提出一個適應性的號誌控制方法，來改善出口匝道回堵至高速公路主線之問題。
　　本研究針對國道1號林口B北上出口匝道為研究對象，應用衝擊波理論建立出一個符合此出口匝道之回堵模式，透過觸動控制之方式，找出車輛偵測器設置位置並探討延長不同綠燈時間情況下之結果。根據結果顯示，最遠可將車輛偵測器設置於停止線上游210公尺，而最近距離為100公尺，其中以控制點210公尺，延長35秒綠燈時間其出口匝道綠燈總延長時間達最小值為525秒；若為降低對於其他方向車流之衝擊，則可選擇控制點150公尺，延長15秒綠燈時間其出口匝道綠燈總延長時間為540秒。

For a long time, National Freeway No. 1 is the traffic artery of the Western Corridor. Therefore, during the peak hours, the traffic entering and leaving the mainline of the freeway increased, while the off-ramp in the metropolitan area caused congestion. When the traffic flows spillback to the freeway mainline, it not only affects the speed of the traffic, but also has safety concerns for the main traffic. Congestion on off-ramp often propagates the traffic queue to the freeway mainline and occupy the shoulder lane. Therefore, this study proposes an adaptive signal control to improve the problem of off-ramp spillback to the mainline.
This study uses Linkou B north off-ramp of National Freeway No. 1 as the research object, using shock wave theory to establish a spillback model that meets this off-ramp, and find out the location of the vehicle detector by actuated control and analysis the results of extending different the green time. According to the results, the vehicle detector can be set up to 210 meters upstream of the stop line, and the nearest distance is 100 meters, of which set up to 210 meters, extend the green time for 35 seconds, and the minimum value of the total extend green time at off-ramp is 525 seconds. In order to reduce the impact on the traffic flow in other directions, can be selected to 150 meters, and the green time of the total extend green time at off-ramp is 540 seconds.

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