公路下坡彎道段開設丁字路口交通安全評估──以斗南鎮台1丁新光陸橋引道下坡彎道段為例

Traffic Safety Assessment of Opening a T-Intersection Near Highway Downhill Curve Section - Dounan Township Provincial Highway No.1 Ding Xinguang Bridge Approach Curve Section

隨著都市發展，交通需求益增，道路也陸續開闢，新闢道路與原有道路因現地條件無法直接銜接為平交路口，使得往來動線須繞行產生交通瓶頸，本研究以斗南鎮東外環與台1丁線銜接為例，該處台1丁為新光陸橋引道段且為彎道，現況新生二路無法直接銜接，使得往來動線須繞行造成用路人不便，相關道路路網功能未能完善，本研究以相關規範針對平交路口平面交角、縱坡度及應變視距等進行安全評估，以釐清改善為丁字路口是否交通安全、彎道段是否有盲點等疑慮，之後亦提出平交路口及交通設施規劃。

"New roads have been built as the development of city increases traffic demand. Due to current site conditions, new roads and the original roads cannot be connected directly into a crossroad, this causes traffic flow have to take a detour and create bottlenecks. This research takes Dounan township eastern bypass road and Provincial Highway No.1 Ding as an example. The site of this study locates at Provincial Highway No.1 Ding Xinguang Bridge approach, which is also a curve, currently Xinsheng 2nd Road (Known as Dounan township eastern bypass road) cannot directly connect with Provincial Highway No.1 Ding, causes vehicles have to take a detour and formed nearby area become an incomplete road network. This research took road engineering specifications of our nation as reference to examine horizontal alignment、longitudinal gradient and reaction sight distance in order to clarify whether connecting two roads into a T-intersection near a curve is eligible to traffic safety, also purposed planning and design of transportation facilities after examination."