A common modular precast concrete structure for road traffic management and safety protection. It is mainly used to separate the opposite lane, guide the passage of vehicles, protect workers in the construction area and prevent vehicles from colliding into dangerous areas. The special angle and slope design of the guardrail is designed to minimize vehicle damage and guide the vehicle safely back to the traffic lane by raising the wheels and guiding the vehicle to turn in the event of a vehicle collision, while preventing vehicles from crossing the guardrail and causing a frontal collision. Due to the use of strong and durable concrete materials, they can withstand high impact, low maintenance costs and long life.