Abstract: A roadbed maintenance device includes a first frame adapted for attachment to the front end of a vehicle, and a second frame to which a moldboard is joined. The first frame and the second frame are pivotably joined by a parallelogram linkage, so that the second frame can be pivoted between a lowered position in which the lower edge of the moldboard touches the roadway, and a raised position in which the lower edge of the moldboard does not touch the roadway. The pivoting movement is preferably accomplished by biasing the second frame toward the raised position, and applying a force to accomplish pivoting toward the lowered position. The pivoting force is provided by a gas-actuated cylinder linked to the second frame, using a compressed gas source on the vehicle. The moldboard is desirably made of molded rubber.