基于路网监控的大雾天气高速公路车距安全预警方法研究  

Research on Expressway Distance Safety Warning Method for HeavyFog Weather Based on Road Network Monitoring

作　　者：杨建 张奎 余春益 王剑非 YANG Jian;ZHANG Kui;YU Chunyi;WANG Jianfei(Qujing Xuanfu Expressway Investment and Construction Development Co.,Ltd.,Qujing,Yunnan 655099,China;Yunnan Construction and Investment Holding Group Co.,Ltd.,Kunming,Yunnan 650599,China)

机构地区：[1]曲靖市宣富高速公路投资建设开发有限公司,云南曲靖655099 [2]云南省建设投资控股集团有限公司,云南昆明650599

出　　处：《公路工程》2024年第5期175-180,共6页Highway Engineering

基　　金：云南省重大科技专项计划项目(202102AD080003)。

摘　　要：大雾天气的持续时间、强度和范围都是不确定的,导致高速公路上能见度会在短时间内出现剧烈变化,难以准确估计和预测大雾天气下的最大能见距离,导致无法及时减速以避免与前车碰撞。针对该问题,提出了基于路网监控的大雾天气高速公路车距安全预警方法。根据光照强度,计算空气透过率,得到路网监控下空气最大能见距离。构建基于路网监控的大雾天气高速公路车距安全预警系统架构,分割能见度图像,引入暗通道权重,得到大气折射率图,获取去雾图像。计算后车、前车制动行驶距离,获取临界安全行车间距。试验结果可知,该方法经过预警使得后车速度比前车速度减速快,在制动时间为80 s时,车距就保持了7 m不变,不会发生碰撞。The duration,intensity and scope of foggy weather are uncertain,resulting in dramatic changes in visibility on the expressway in a short period of time.It is difficult to accurately estimate and predict the maximum visible distance in foggy weather,which may cause inability to decelerate timely to avoid collision with the preceding vehicle.To solve this problem,a safety warning method based on road network monitoring is put forward.Transmittance of air is first calculated based on light intensity,and then the maximum visible distance under monitoring of road network is obtained.Further,the architecture of expressway vehicle distance safety warning system based on road network monitoring in foggy weather is constructed through segmentation of visibility image,introduction of dark channel weight,and removal of fog in the image using atmospheric refractive index map.Then braking distances of front and rear vehicles are calculated to obtain the critical safe driving distance.Experimental results show that the proposed method makes the rear vehicle decelerate faster than the front vehicle after early warning.Distance between vehicles keeps at 7 m to avoid collision when the braking time is 80 s.

关 键 词：路网监控 大雾天气 能见度 高速公路 车距安全预警 

分 类 号：U495[交通运输工程—交通运输规划与管理]