Abstract: An articulatable barrier for selectively restricting access to a parking space, roadway, passageway or the like. The barrier includes a base and a barrier frame that is pivotally journaled through the base at a pivot axis for pivotal movement of the frame between a first obstructing position and a second nonobstructing position. The base has an aperture formed therein above the pivot axis. The frame carries a center bolt for movement of the bolt between a first lowered position and a second raised position. In the first lowered position, the bolt is received in the base through the aperture, for supporting the frame and for maintaining the frame in the obstructing position. In the second raised position, the bolt is spaced from the aperture and the base for permitting the pivotal movement of the frame. Means is provided for moving the bolt in a second raising direction, wherein the bolt is withdrawn from the base and the aperture being moved into the second raised position.