Bridge guardrails refer to the barriers installed on bridges, designed to prevent out-of-control vehicles from crossing over the bridge. They serve to prevent vehicles from breaking through, driving under, or jumping over the bridge, while also enhancing the aesthetics of the bridge architecture. Next, we'll introduce how to categorize the collision resistance levels of bridge guardrails.

There are numerous methods to classify bridge guardrails, including categorization by their installation location, construction features, and collision resistance performance. By installation location, they can be categorized as bridge-side guardrails, median barrier guardrails, and pedestrian/traffic lane separation guardrails. By construction features, they can be classified into beam-column guardrails (made of metal and concrete), reinforced concrete wall-type widened guardrails, and composite guardrails. By collision resistance performance, they can be categorized as rigid guardrails, semi-rigid guardrails, and flexible guardrails.

Bridge guardrails commonly come in three forms: concrete guardrails, wire rope guardrails, and guardrail with steel beam. The selection of bridge guardrail types should first be based on the highway grade, taking into account factors such as safety, coordination, the characteristics of the objects to be protected, and the site's geometric conditions to determine the collision resistance level. Then, the construction form should be chosen based on the structure itself, cost-effectiveness, and factors such as construction and maintenance. There are three burial methods: direct embedding of posts, flange connection, and integrating the guardrail with the bridge deck through reinforcing bars. Under permissible conditions, removable guardrails can be used.

Guardrails are generally categorized by their collision-avoidance capabilities, such as B-grade guardrails, A-grade guardrails, SB-grade guardrails, SA-grade guardrails, SS-grade guardrails, and so on.

Typically, bridge guardrails are categorized into three types: rigid, semi-rigid, and flexible. Rigid guardrails are generally represented by cast-in-place bridge guardrails, semi-rigid guardrails are typically represented by corrugated bridge guardrails, and flexible guardrails are usually represented by cable-stayed bridge guardrails.