Bridge railings are an important component of bridges. They not only enhance the aesthetics and radiance of the bridge, but also serve as a good warning, barrier, and prevention of traffic accidents. The main functions of bridge guardrails are as follows:

1. The separation function of bridge railings: Bridges can separate motor vehicle, non motor vehicle, and pedestrian traffic through bridge railings, vertically separating the road section, allowing motor vehicles, non motor vehicles, and pedestrians to travel separately, improving the security of road traffic and improving traffic order.

2. The blocking function of bridge railings: Bridges can block bad traffic behavior by using bridge railings to block pedestrians, bicycles, or motor vehicles attempting to cross the road. It requires bridge guardrails to have a certain height, density (referring to vertical barriers), and strength.

3. The warning function of bridge railings: By installing bridge railings, the contours on the bridge railings are simplified and clear, warning drivers to pay attention to the existence of guardrails and pedestrians and non motorized vehicles, thereby preventing traffic accidents.

4. The beautification function of bridge railings: Through the different materials, forms, shapes, and colors of bridge railings, bridges achieve harmony and coordination with the road environment, playing a role in beautifying bridges and the environment.

It can be seen that urban bridge railings are not only a simple isolation of roads, but more importantly, their purpose is to clearly indicate and transmit urban traffic information to pedestrian and vehicular traffic, establish traffic rules, maintain traffic order, and achieve the effects of guarantee, speed, orderliness, smoothness, convenience, and aesthetics in urban traffic.