The utility model discloses a guardrail bar is prevented in embed -type adjustable lane, including the steel wire, the steel pipe rotation axis, spring and regulating spindle, two yellow line positions in the middle of two -way runway, a guardrail recess is excavated respectively to quick lane and ordinary lane division line position, set up concrete leveling layer bottom the recess, for character cut in bas -relief shape steel sheet on the leveling layer, character cut in bas -relief shape both sides set up the slip of bar recess, installation direction fixed pulley in the recess, set up the regulating spindle in guardrail both sides, the guardrail regulating spindle sets up two sets of spacing kaysers with the steel wire contact position, guardrail and character cut in bas -relief shape steel sheet are connected to the steel pipe rotation axis in the round hole of guardrail bottom, set up spring assembly at character cut in bas -relief shape steel sheet inslot, the steel wire and the electrical driven system A of guardrail one end are connected, the steel wire and the electrical driven system B of the guardrail other end are connected. The utility model discloses according to different period traffic flow sizes, can change driveway quantity canalized traffic rationally fast, in time guide the vehicle current smoothly, guarantee driving safety.