本研究之目的係為發展緊急救援車輛之行車路徑導引系統，提供行駛路徑給駕駛人，使緊急救援車輛能夠正確且快速地到達事故地點；減少緊急救援車輛到達事故地點的時間，使意外事件能在最短的時間內獲得排除，以降低傷害之程度。並在緊急救援車輛行駛的路徑上進行號誌優先通行控制，使車輛能夠順利通過路口並減少車輛行經路口的號誌延滯。經由號誌優先通行控制的配合，降低駕駛人的心理負擔，減少二次意外事件的發生，使車輛能夠順利且安全地到達事故地點。藉由路徑導引與號誌優先通行控制的協助，讓緊急救援車輛得以及時的趕到意外事件現場，即時的拯救所有危及其健康利益的受害者，同時適時地協助醫療救護機構，使其能夠讓受害者增加生還的機會同時減少其他傷害。
本研究首先利用PARAMICS模擬軟體模擬道路交通狀況，獲得路網在每個時段每個路段在沒有號誌延滯下的路段旅行時間，在實體系統運作上此部份係為系統的事前離線作業。當事故發生時即啟動本系統「最佳路徑」控制邏輯，經由上述的路段旅行時間資料，利用準動態最短路徑模式搜尋派遣中心至事故發生地點之前K條最短路徑。待前K條最短路徑求出後，藉由上述在無號誌延滯下的旅行時間與號誌控制等資料，求出前K條路徑的最佳號誌控制方法，並求解在有號誌優先通行控制下的最佳路徑以做為緊急救援車輛的導引路徑。
本研究中所使用的實例路網係取自台北市區路網，選擇大同區為主要的分析範圍。經由完整的模擬分析後，其結果可確認本研究所開發的模式之可行性與有效性。

This study aims at developing a new route guidance strategy combined with a set of signal preemption logic for the emergency service vehicles. A well known quasi-dynamic path-finding algorithm, which has been proven as the most efficient one of this kind, is employed to search for the K shortest paths of any emergency vehicle between its dispatching center and the emergency incident site. Some signal preemption logics for the emergency vehicle along with all existing timing constraints and with minimum impacts to all those vehicles coming from its competing directions are developed and implemented at all intersection along its shortest path.
Based on an advanced traffic flow simulation model, i.e. PARAMICS, travel times of its K shortest paths with existing signal timings along its travel path for all the OD pairs are generated to establish an important travel time database ready for the following analysis. Each time when revised travel times of all detector zed road links have been computed from those most recent traffic volumes, the said travel time database is then updated accordingly. Once the emergency vehicle approaches a downstream intersection, a dedicated sensor is actuated and then the system restarts the signal preemption logic at its downstream intersection and recomputes or updates the existing K shortest paths. Both tasks have been finished before the emergency vehicle finally reaches the downstream intersection. At the same time, the updated shortest-path information will be transmitted to the emergency vehicle so as to let it making the correct turns in time before it finally arrives said intersection. For the whole route guidance and signal preemption model, the minimum total travel time for the emergency vehicle is set to be a major optimization objective.
A case study of the Ta-Tung Police Jurisdiction in Taipei City has been applied to test the performance of those combined logics. The results from sufficient simulation runs have finally confirmed the feasibility and effectiveness of those combined model and proposed logics.

參考文獻
1.Ahuja R. K., Magnanti T.L., and Orlin J.B., 1993, “Network Flows”, P 108-111.
2.Al-Deck, H. et al., “Potenial Benefits of In-Vehicle Information System in a Real Life Freeway Corridor under Recurring and Incident-induced Congestion”, IEEE VNIS’89, pp.288-291, 1989.
3.Arata, Toshihiro, Teruyuki, Takashi, Akihiko, ”Status Report of Field Verification Test in UTMS’s Emergency Call System”, 6th World Congress on ITS, 8-12 August 1999.
4.Bill Alan Cisco, Snehamay Khasnabis, “Technique to Assess Delay and Queue Length Consequences of Bus Preemption”, Transportation Research Record, No. 1494, pp.167-175, 1995.
5.http://www.eitsa.org, “Mayday Plus Operational Test Underway”, November 9, 1999.
6.http://www.ertico.com, “AA ITS Services (UK)”.
7.http://www.ertico.com, “ECC - Emergency Call Center (Germany)”.
8.http://www.ertico.com/what_its/succstor/ptsweden.htm
9.http://www.ertico.com/what_its/succstor/pubtrspt.htm
10.http://www.itsa.org, “Emergency Vehicle Signal Preemption Systems”, August, 1998.
11.http://www.yulon-motor.com.tw/international-2.htm
12.ITS HANDBOOK, Highway Industry Development Organization, Japan, Oct. 1998.
13.Makoto, Toshihiro, Zuiki, “Fast Emergency Vehicle Preemption Systems (FAST)”, 6th World Congress on ITS, 8-12 August 1999.
14.Masatomo, Hisashi, Seiji, Koichi “DEVELOPMENT OF A NAGATION SYSTEM ADPTRD TO THE “HELPNET” EMERGENCY CALL SERVICES”, 8th World Congress on ITS, 30 September–4 October 2001.
15.Matrins, E. Q. V., “An algorithm for ranking path that may contain cycles”, European Journal of Operational Research 18 (1984) 123-130.
16.Seiji, Yukio, Hiroyuki, Takashi “Development of Basic Technologies for the MayDay System”, 6th World Congress on ITS, 8-12 August 1999.
17.Smith, J.C. et al., “Some Possible Effects of Autoguide on Traffic in London”, IEEE VNIS'89, pp. 282-287.
18.Toshikazu, Hiroyuki, “The Incorporation of an Emergency Call System into the Traffic Control System of the Metropolitan Police Department”, 6th World Congress on ITS, 8-12 August 1999.
19.Tsuji, H. et al., “A Stochastic Approach for Estimating the Effectiveness of a Route Guidance System and Its Related Parameters”, Transportation Vol. 19, No.4, 1985.
20.何志宏等，「台灣地區先進交通管理系統(ATMS)中都市交通號誌控制邏輯標準化與系統建置標準作業程序之研究-定時式／動態式控制邏輯標準化：規劃報告」，交通部運輸研究所，民國90年4月。
21.何志宏等，「先進式微觀車流模擬器－PARAMICS模擬軟體應用於高速公路與市區道路交控系統整合策略研究」期中報告，交通部運輸研究所，民國90年7月。
22.吳健生，「公車優先號誌之設計與應用」，都市交通81期，民國84年5月。
23.吳淵展，「公車絕對、條件與補償優先號誌時制之研究」，中央大學土木工程研究所碩士論文，民國87年。
24.李德紘，「以多種用路人行車路徑導引模擬模式探討交通資訊效益與感應時制之研究」，中央大學土本工程學研究所碩士論文，民國82年。
25.邵福臨，「應用動態號誌時制於行車導引系統之研究」，國立成功大學交通管理科學研究所碩士論文，民國81年。
26.張式先，「動態路選擇模式應用行車路線導引系統之研究」,國立成功大學交通管理科學研究所碩士論文，民國81年。
27.傅介棠，「多條最短路方法應用於行車路線導引系統之運輸效果模擬分析」，國立成功大學交通管理科學研究所碩士論文，民國79年。
28.顏贊峰，「公車優先號誌控制策略於無設站路口之應用」，中央大學土木工程研究所碩士論文，民國85年。
29.蘇志強、莊弼昌、李紹榆，「全觸動公車優先通行號誌控制模式之研究」，中華民國運輸學會第十三屆論文研討會，中華民國87年12月。