傳統的汽車導航系統均爲單機封閉型系統，在路徑導航上僅考慮起點到目的地間之最短路徑 而未考慮交通流量，換句話説，假若所有駕駛人使用相同的導航系統，從同一起點到同一目的地， 則該系統所建議之最短路徑將會是同一條路徑，勢必會導致該路段之壅塞，若要解決上述問題， 必需運用無線通訊技術，將相關交通流量資料傳送至自動導航系統内，再由自動導航系統依據即 時路況資料，規劃出能避開壅塞狀況的最佳路徑。本研究係針對台灣現有之行動電話通訊系統、 中繼式無線電通訊系统及雙向無線電通訊系統等三種無線通訊系統，分别開發通訊程式，並建立 三種不同大小的資料檔案，分别在不同的無線通訊系統上進行資料傳送，記錄其傳送時間，最後 針對此三種無線通訊系統之使用便利性、通訊程式撰寫難易性、傳輸效能及系統架構功能等相關 因素加以综合評比。此外，爲達成上述分析我們開發了一個汽車自動導航系統，並整合無線通訊 功能，以獲得即時路況資訊，並依據即時的壅塞路況資料進行最佳路徑計算、修正及進行最佳路 徑指引，以達成眞正避開壅塞路段導引最佳路徑並舒導交通之目的。另本系統透過接收衛星定位 資料，即時在電子地圖上顯示車輛位置，同時都市道路壅塞路段顯示電子地圖上，使駕駛人得以 暢行無阻。在原有汽車導航系統中加入無線通訊功能，不但能提供動態交通流量及導引駕駛人行 駛最佳路徑，同時可運用無線通訊功能在便利性及安全性上提供更高附加價値的服務，諸如警急 救援、汽車竊盜防範、現有停車位及醫院病房床位等訊息查詢，提供更高附加價値的服務。

Traditionally, most of vehicle navigation systems only statically consider the shortest path for each source destination pair rather than the traffic flow. On the other word, it will still result in congestion when all drivers adopt the same system to compute the shortest path from source to destination. For the sake of solving the above problem, we add the dynamic real time information to the navigation system via communication techniques. However, the dynamic real time situation must be sent by means of a wireless communication system and calculated by the navigation system for the best path. This paper firstly aims at the programming communication software and establishing different data files for testing transmission time in performance to cellular phone, frame-relay and full duplex wireless communication systems. Then compare their usability, programming feasibility and system architecture functions. Finally, we integrate these techniques into the best communication environment for the navigation system of the real time traffic situation. Additionally, we develop a prototype system in which it can access real time traffic data and position data from a satellite system through GPS receiver. Moreover, communicate between them to display the car position in an electrical map. It is able to not only provide drivers to understand the traffic jam situation but also choice the best-driving path in the shortest time by using computing a designed Dijkstra's algorithm. Once such the system is built, it can offer dynamic traffic flow control and guide drivers the best path with convenience and secure services.