1. The guardrail is installed in the middle of the road. When a vehicle loses control, it can effectively prevent the out-of-control vehicle from running into the opposite lane and causing a secondary collision.

2. The guardrail is a semi-steel protective facility with very good toughness. When a vehicle hits, it can slide smoothly, forcing the vehicle to return to the normal route.

3. It can slow down the damage caused to the driver by the impact. The national standard guardrail board has good toughness and is not easy to break. When it is hit, the guardrail board can be deformed to force the vehicle to stop. The buffering force is very good, reducing the damage caused by the accident.

4. Guardrails also have an advantage that cannot be ignored. They allow drivers to see the edge of the road clearly. Moreover, guardrails are also very effective at night. Under the illumination of lights, they make it easy for drivers to identify the direction of the road.