臺灣自開放大型重型機車合法上路以來,大型重型機車駕駛人與路權開放支持者以稅制繳納公平性,及外國案例等論點,要求毋須對大型重型機車路權多餘管制,但許多民眾卻仍對於大型重型機車之駕駛安全存疑。本研究採用警政署2003年至2011年肇事資料,針對大型重型機車行駛路權開放進行討論,在2007年11月1日開放可行駛快速道路及一般道路快車道後,曝光度日漸提高的大型重型機車對各種車輛肇事率之影響。本文以各種車輛不同之延車公里 計算肇事率做為被解釋變數,各種車輛交通量佔比做為解釋變數,並設定虛擬變數討論路權開放前後差異,以最小平方法估計參數檢定分析後發現:1. 大型重型機車肇事率明顯高於其他車種;2. 大型重型機車確實對其他車輛存在交通外部成本,當大型重型機車曝光度增加後,小型車肇事率顯著上升;3. 將普遍認為較危險之車種-大客車及大貨車加入考量後,大型重型機車對小型車肇事率之正相關仍較顯著,大客車及大貨車於交通量佔比提高,對小客車及小貨車肇事率影響則較不顯著。
Since legitimate importation of heavy motorcycles in Taiwan is permitted, motorcycle riders have strongly claimed their right of unlimited road right through the points of equal obligation to pay tax and referring to foreign legislative examples. However, the public is still doubtful to the safety issue of heavy motorcycle on the road. In this study, we use the accident database of National Police Agency of Taiwan from 2003 to 2011 to find out the existence of the accident externality. We define accident rate in this article as the number of accident per vehicle-kilometer to capture risk character more accurately than count it with per register number. After estimating by OLS model and testing, our results show that: 1. The accident rate of heavy motorcycles is much higher than any other kind of vehicles. 2. The accident externality does statistically exist. When the exposure rate of heavy motorcycles increases, the increases of the car and truck accident rate are statistically significant. 3. Take into consideration the fullsize vehicles which are seem to be more dangerous, the influence of heavy motorcycles still much more significant.