What are the classifications of road traffic barriers

What are the classifications of road traffic barriers? Next we will briefly understand:
The fence can be divided into two types according to its longitudinal setting position on the road; the fence can be divided into road side fence and central divider fence according to its horizontal setting position on the road;
According to the deformation degree of the guardrail after collision, it can be divided into flexible guardrail, semi-rigid guardrail and rigid guardrail. Among them, the flexible guardrail has the largest deformation, the rigid guardrail has the smallest deformation, and the semi-rigid guardrail has a centered deformation.