臺十五線易肇事地點評定與改善對策之研究

Abstract

西部濱海縱貫公路改善計畫係政府十四項重大建設之一，其中台十五線，(關渡橋-香山段)於民國八十七年七月改善完成，對於提昇行車效率有正面效益。但通車後肇事率與肇事嚴重性有偏高之現象,因此本研究透過肇事資料之蒐集分析依所建構之評定模式確認易肇事地點，分析其肇事原因,據以研擬改善對策,以減低肇事之發生機率及嚴重性。 本研究以新竹縣市境內西濱西快路段為研究範圍，就其最近一年半內所發生之肇事資料，首先依易肇事危險績效值，評定易肇事地點;其次再依肇事型態,肇事原因,研擬相對應改善手法與改善措施後經檢討分析其肇事原因、肇事類型與道路條件等相關資料予以歸納為四類主要問題分別為：交叉路口過多過密問題、道路幾何條件不良問題、路型變化及速限變化銜接處問題及西快公路交通運轉特性與一般公路不同產生行車安全問題，分別提出改善案例。 此外,有鑒於現行易肇事地點，一般均依民意代表建議、人民陳情或道路管理單位巡查發現缺失，而予以改善，均屬零星無計畫性之改善，因此有必要建立易肇事地點改善之標準作業程序，並祈統一作業流程，所需各項表格，以達標準化、程序化之目的,並提供各道路管理單位作為改善作業之參考。

The Western Coastal Penetrated-island Expressway's improvement plan is one of the government's fourteen major projects , among of them that Route Tai-15（Kuantu Bridge-Hsiangshan）has been completely finished in July,1998. It has observable positive benefits on behalf of upgrading its traffic efficiency, nevertheless, the sign of accidental rate has risen and has become more serious after operation. Therefore, this study is not only through getting accidental data to analyze, but also to build up the module of estimation for accident-prone location identity, the cause of accident analysis, and that come up with improvement measures to reduce the possibility of accident and its severity. This study is the Western Coastal Expressway in Hsinchu County and in Hsinchu City, and that the accident has taken place within one and one half of year. Initially, according to its performance value of accident-prone jeopardy estimating its location, secondly, based on its accident types and accident causes, there countermeasures are provided by means of method and step after reviewed and then main four-type issues are induced by analyzing its accident causes as well as accident types and road conditions. On the other hand, that questions are too high density of road cross, poor geometrical road condition, linking up on both road type changing and speed shifting, traffic safety is induced distinction between the operation characteristic of Western Coastal Expressway and highway are also offered its an example for improvement, respectively. Besides, owing to current accident-prone location is frequently dissolved by people's representative's proposal, people's appeal or road-inspector, that are odds and ends and out of our plan. Therefore, we need to create a standard operation procedure for accident-prone location improvement, and we pledge that unify the operation proceedings, various forms necessarily. So that, we can reach the goal of standardization as well as process and that will provide as a reference to road administration for improvement.