7月26日，车辆从北京广渠门桥底下的水位警戒线旁驶过。为避免再发生积水导致车辆在低洼地被淹事故，北京交管部门开始对全市易积水的下凹式立交桥、公路、铁路立交桥等施划积水水位警示、警戒标线，为司机涉水行车提供参考，同时为相关部门了解区域积水情况、采取处置措施提供依据。据了解，施划的积水水位标线分为黄色警示线和红色警戒线，宽5厘米。其中，黄色警示线距地面最低点20厘米，提示当水面在警示线以下时，道路可以通行，但机动车需低速缓慢通过；红色警戒线距地面最低点27厘米，水位达到红色警戒线位置时，说明积水深度已经达到汽车排气管平均位置，机动车无法正常通行。新华社记者 金良快 摄      July 26,，Traffic from Beijing under the water level of guang qu men bridge the cordon drove by。To avoid happen again in low-lying areas in water flooded the vehicle accident，Beijing tubal branch began to sink to the water in the city overpass type、highway、Railway bridge; water such as stroke water level warning、Alert lines，To provide reference for the driver wade through the traffic，At the same time for relevant departments know water area、Take disposal measures to provide the basis。According to understand，The water was divided into water lines delimit yellow warning line and red lines，5 cm wide。Among them，Yellow warning line is apart from the ground, low 20 centimeters，Tip when the water in the warning line，Road traffic can，But to slowly through the low speed motor vehicles；Red lines from the ground lows 27 cm，Water level to red lines position，Water depth that have already reached the tailpipe average positions，Motor vehicle cannot normal to traffic。The xinhua news agency JinLiang quickly taken