有鑑於目前國內尚無有條件優先號誌之相關執行依據，本研究為國內公共運輸系統交通環境改善，將提出一套適合所有大眾運輸工具之有條件優先號誌執行策略，進一步研擬有條件優先號誌時制設計邏輯，使國內交通管理部門時制計畫之設計有所依循，並有效增進大眾運輸工具之行駛效率，不僅可適用於國內輕軌運輸系統上，更可以直接運用在現有快捷公車系統改善計畫(如台中BRT)，或是市區公車之沿線號誌建置計畫，以確保在對平面道路交通影響程度最小之下，給予大眾運輸工具更多優先通行之權利，以提升國人搭乘大眾運輸工具之意願。
目前高雄市輕軌第一階段，係採完全優先號誌控制策略，當輕軌列車於輕軌共用時相前、後時相紅燈時間抵達路口，以綠燈延長、紅燈截斷等方式，延長輕軌共用時相之綠燈時間，或直接插入輕軌時相，讓輕軌列車不須停等紅燈即順利通過路口，待輕軌列車通過後再回到原時制計畫運作，雖完全優先號誌執行，可大幅減少輕軌列車旅行時間，卻大大破壞了原路段號誌連鎖功能，及造成支道車流回堵情形嚴重，就整體路網而言，行駛效率績效非常不好。
本研究將藉由輕軌第一階段運行經驗為例，找出問題並提出解決對策，運用國內自行研發之車流模擬軟體(DynaTAIWAN)，以輕軌第二階段大順路段，為本研究模型建構目標，實際模擬有條件優先號誌之執行環境，以驗證於有條件優先號誌策略執行下，可有效降低對整體路網之交通環境衝擊。

In order to provide better and faster transit service, priority signal control strategies should be implemented; however, the discussions on conditional priority signal control strategies are still insufficient in Taiwan. This study presents a conditional priority signal control logic for public transport systems, especially for Bus Rapid Transit (BRT) and Light Rail Transit (LRT).
Kaohsiung Light Rail Transit System (Phase 1) adopts a full priority signal control strategies, in which green time is extended or red time is truncated to give LRT vehicle full priority. The full priority signal policy can greatly improve the travel time of the light rail, but it also destroys the traffic signal coordination. As far as the overall road network is concerned, traffic system performance is highly deteriorated.
This study proposes a signal control logic for conditional priority for transit vehicles. Signal control policies and possible strategies, including green time extension, red time truncation, new phase, and skip phase, are evaluated based on transit vehicle arrival times and overall traffic system performance.
Kaohsiung LRT (Phase 1) operation experience is examined and problems are identified and solutions are proposed. Empirical data from Kaohsiung LRT (Phase 2) on Dashun road are used and simulation results from DynaTAIWAN, a simulation-assignment model, are investigated to validate the system performance of the proposed control policies. The results show that the conditional priority signal control strategies can effectively improve the overall system performance.

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