Glare guards are a traffic safety product manufactured to install on the central median of highways, designed to alleviate glare from oncoming vehicle headlights. They are commonly set up on the护栏 or in the middle of the护栏 on the central median of highways, and some are also installed on the central opening of the guardrails. They are categorized by material into steel glare guards, plastic glare guards, and fiberglass glare guards. In terms of appearance, they are usually classified as straight boards, reverse S-shaped, embossed glare guards, and highway landscape glare guards, among others.