Highway guardrail is a belt shaped protective and energy absorbing structure installed on the outside or central divider of highway lanes. Its main purpose is to absorb collision energy, buffer and guide through blocking, guardrail deformation, or vehicle climbing in the event of an accident, thereby blocking the vehicle and reducing the degree of injury to drivers and passengers. According to the location of the cross-section of the road, highway guardrails can be divided into roadside guardrails and central median guardrails. According to the degree of deformation after being hit by a vehicle, it can be further divided into rigid guardrails, semi-rigid guardrails, and flexible guardrails.

In terms of materials, highway guardrails have multiple options such as iron, stone, PVC, wood, stainless steel, glass, etc. to adapt to different environments and needs. These guardrails not only have protective functions, but also incorporate aesthetic and environmental elements, becoming an indispensable part of modern transportation construction.

High speed guardrails play an irreplaceable role in traffic safety. Firstly, it can effectively prevent vehicles from running into opposite lanes or falling into roadside ravines after losing control, reducing the occurrence of traffic accidents. Secondly, the installation of guardrails can guide the driver's line of sight and improve driving safety. In addition, safety facilities such as reflective strips and delineators on guardrails can provide additional warning effects at night or in adverse weather conditions, helping drivers identify road boundaries and obstacles.

Due to long-term exposure to outdoor environments, high-speed guardrails need to have excellent corrosion resistance and wear resistance to cope with various harsh weather conditions. The design of high-speed guardrails considers the convenience of installation and maintenance, making it convenient for construction personnel to quickly install and maintain in the later stage.