Water horse is usually a structure with a small top and a large bottom, and there is a hole above it to add weight by water injection (so it is called water horse, which is a plastic shell obstacle used to divide the road surface or form a barrier). Note: Non-water-filled wooden or iron movable obstacles are called horse refusal), and some water horses also have transverse through holes to be connected by bars to form a longer barrier chain or barrier wall. It is generally used for road traffic facilities, and is common at the intersections of expressways, urban roads and overpass streets. On the afternoon of May 5, 2020, at about 0/4 o'clock in Kloc-0, the main bridge of Humen Bridge, the traffic artery of the Pearl River Delta, shook greatly, causing social concern. According to the preliminary judgment of the expert group, the main reason for this vibration of Humen Bridge suspension bridge is that water horses are continuously arranged along the guardrail across the bridge under specific wind environment conditions, which changes the aerodynamic shape of steel box girder and produces bridge vortex vibration under specific wind environment conditions.