受碰撞后的护栏变形程度：受碰撞后护栏的大动态变形量。
Deformation degree of guardrail after collision: large dynamic deformation of guardrail after collision.
不应超过可允许的变形距离。
The allowable deformation distance shall not be exceeded.
该原则主要是考虑车辆碰撞后是否允许一定的变形。
The principle is mainly to consider whether a certain deformation is allowed after vehicle collision.
例如：桥梁结构物一般都位于地面以上很高处。
For example: bridge structures are generally located very high above the ground.
