本論文針對借助行車無線網路之技術增進緊急事件應變能力做了可行性的評估。設想一輛救護車在前往事故地點的途中，可能遭遇壅塞路段導致無法盡早抵達目的地。我們可以運用行動網路技術送出緊急訊息告知用路人有救護車即將經過，並指示用路人迴避，以免阻礙救護車行進。
我們提出EM4AT（Emergency Messaging for Ambulance Traveling）來為緊急救護單位即將行駛的執勤路線（engaging route, ER）找出相關的路段。這些相關路段平常會有大量的車流進入ER，因此我們預期若能將緊急訊息廣播於其上，能有效使大部分的用路人事先避開ER，從而降低ER上的總車流量並使救護車能順利通過。模擬結果顯示我們可以在僅涵蓋五到六成相關路段的情況下仍舊讓超過八成的車輛收到緊急訊息，並且驗證了透過降低ER上的車流量著實可以有效減低救護車所需的行駛時間。

This study presents the methodology and evaluation of realizing an emergency message (EM) transmission for efficient rescue services. A dispatched ambulance might occasionally get stuck in a huge traffic and may delay its arrival. The EM, sent via vehicular network, is used to warn drivers about the traveling ambulance. The recipients of EM could kindly avoid occupying the engaging route (ER) that the ambulance is about to take, such that the medical services can be delivered as quickly as possible.
We proposed Emergency Messaging for Ambulance Traveling (EM4AT) to smartly choose part of the relevant road links that contribute meaningful traffic into ER, then broadcast EM over them. We develop the simulation to estimate the advised traffic and travel time on ER. It shows that approximately 80% of drivers can receive EM while only 50~60% of the relevant road links are required to be broadcasted; also, this approach does save travel time significantly without incurring too much of network cost.

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