Most of the bridge guardrails used on highways and bridges nowadays are made of metal and are basically exposed to the air. Prolonged exposure to the sun, wind, and shower can cause corrosion of guardrails. Because bridge guardrails are tools used to prevent pedestrians or vehicles from crossing them in emergency situations, it is highly likely that their durability will not be guaranteed in the long run.

As a metal bridge guardrail, its primary value is to withstand all weather conditions in the environment, as well as withstand the intrusion of violence. To some extent, it should not be too hard and reliable compared to walls, and at the same time, it should be able to reduce pressure and slow down no matter how much impact it is subjected to.

Therefore, while using metal bridge guardrails, maintenance of the guardrails is necessary. After the construction of the metal guardrails, a layer of anti-corrosion paint needs to be applied to the guardrails to block the oxidation reaction between air and metal. And it is necessary to take care of the metal guardrail every once in a while, which can delay the aging of the guardrail and also beautify the environment.