高速公路出口匝道地面衔接部功能区的界定

Functional Area Definition of Off-ramp Connective Road

匝道设计的合理与否,直接关系到高速公路的交通安全和运行效率。由于高速公路主线与出口匝道之间交通流运行速度存在较大的差异,导致在出口匝道上交通流运行极不稳定,并产生大量的交通冲突,成为高速公路拥堵和事故多发地带。为改善高速公路出口匝道的安全现状,本文在提出出口匝道地面衔接部功能区概念的基础上,给出了功能区的界定方法,并最终给出了典型出口匝道衔接部功能区范围的建议值,为改善高速公路匝道出口功能区内交通安全水平提供了必要的理论支撑和技术依据。

The reasonableness of off-ramp design is related to the freeway traffic safety and efficiency.Because of the great difference in speeds of the vehicles on the off-ramps and the highway,the traffic flow was unsteady and many traffic conflicts were brought out.So,off-ramp is an area of traffic congestion and accident taking place frequently.To improve the safety status of freeway off-ramp,a definition method for the functional area was proposed based on presented a function area concept.At last,the lengths of the representative functional area were suggested,which provided a reference to further improve the efficiency and safety of the traffic stream.