臺灣隨著都市化發展，人口集中之情形越來越嚴重，而因都會區車輛密度高，停車不易，民眾常運用輕便的機車做為短程的交通工具。在擁擠的車道上，汽機車行車事故層出不窮，在雙方當事人各執一詞或機車一方無法言語之情形下，可利用已廣泛運用在學術機構的電腦軟體來重建肇事前後之經過，以釐清肇事責任。但目前大部分為汽車與汽車間之碰撞模擬，汽車與機車間之行車事故模擬則較闕如，其中在路權（道路優先使用權）相當的同向碰撞行車事故，警方及鑑定單位常以碰撞後機車倒地方向作為判斷依據，惟實際案例中常為當事人所不服與質疑，由於事故之責任區分影響當事人權益甚鉅，因而建立一套汽機車間的碰撞模擬系統有其必要性。
由於目前政府交通機關尚未建立汽機車模型之資料庫，故本研究自行應用SolidWorks軟體繪製人偶、機車與汽車模型，並匯入ADAMS軟體設定模型參數，建立同向間汽車與機車之各種碰撞模組後進行模擬，研析車速對人偶與機車之倒地位置與方向之影響，並透過動畫顯示機車運動軌跡及倒地方向。
本研究之結果顯示，汽機車在同向碰撞後，機車之倒地方向與目前警方之判斷依據不盡相符，此點可作為警方及鑑定單位今後在行車事故責任鑑定上之參考。

As urbanization developments continue in Taiwan, the population concentrating in urban areas has become more and more severe. As a result, city vehicle density increase, and parking is hard to find. People move to lighter vehicles like motorcycles for short distance transportation. In a crowded line, automobile with motorcycle accidents happen very frequently; and with each party sticking to his own version, or the motorcycle party is unable to speak, the use of academic institute’s computer simulation to reconstruct the scene prior and after the accident in order to clarify responsibility become widely known. However, most of these collision simulations are suitable between automobile, collision simulation of automobile with motorcycle are still rare. Especially in accidents where both parties are going in the same direction and have the same rights-of-way. The police and forensic unit usually make their ruling based on the motorcycle’s position, which usually brings criticism and doubts. As the responsibility of accident affects both parties’ interest in a big way, it is necessary to create an automobile with motorcycle collision simulation system.

Since the traffic authorities have not build a vehicle related database, we used SolidWorks 3D to draw human figures, motorcycles, and car models in this research. In addition, we imported ADAMS software to input the model parameters. We included many same-direction traffic collision possibilities in the simulation. We studied the vehicle speed in correlation to the direction and position of where the motorcycles fall. Motion trajectory and the direction of where the motorcycle falls are also estimated through animation.

The results of this study show that the rules that police frequently used to reconstruct a traffic accident scenario may not be correct, based on the falling side of a motorcycle in the actual scene after its collision with an automobile. Therefore, the police and the appraisal committees must be more careful on their appraisal work if a motorcycle is involved in an accident.

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