以特殊互通式立交出口区域主线为研究对象,分析了特殊互通式立交出口交通事故特征,运用汽车制动特性、人机工程学及交通心理学原理获取驾驶员在特殊互通式立交出口处的识别视距,且识别视距均比设计规范值高。以特殊互通式立交出口识别视距为基础,运用几何学及高速公路几何线形原理建立识别视距与立交区域主线圆曲线半径关系模型,运用VB程序开发软件,提出特殊互通式立交出口处满足识别视距不同车道数主线圆曲线半径一般值和最小值。结果表明:对待建高速公路互通式立交出口位置所在主线线形应分析识别视距,并应利用识别视距对主线线形指标验算;对已建成特殊互通式立交出口,应加强其安全保障措施,保证主线及驶离主线车辆行车安全。 Taking the main interchange area of ​​special interchange as the research object, this paper analyzes the characteristics of traffic accidents at the special interchange, and uses the principle of automobile braking, ergonomics and traffic psychology to obtain the driver's identification at the special interchange. Line of sight, and identify the line of sight are higher than the design specifications. Based on the recognition of the sighting distance of special interchange, the paper establishes the model of the relationship between the line of sight and the radius of circular curve of the main line of sighting through the geometry and expressway geometric linear principle. By using VB program development software, Different lanes from the line of sight the main line of the radius of the circular curve of the general and minimum radius. The results show that the line of sight of the main line where the exit position of expressway interchange is to be constructed should be analyzed and the line-of-sight should be analyzed, and the linear indicator of the main line should be checked by using the line of sight recognition. For the special interchange of overpass, the safety and security measures should be strengthened to ensure The main line and driving safety from the main line of vehicles.