Abstract: A barrier member adapted for easy mounting on and dismounting from a pair of conical pylon road members comprises an elongated barrier body, usually of thin sheet metal, providing a vertical barrier surface with a pylon-engaging member at each end. Each pylon-engaging member has an aperture of such diameter that it can be mounted on the pylon upper end with the end protruding through the aperture so that the barrier member is retained against transverse movement and is maintained at a predetermined distance above the road surface. Preferably the pylon-engaging member is formed from round cross section rod to provide wedging tangential retaining contact between itself and the softer plastics material of the pylon outer wall upon pressing the member downward on the pylon. The barrier body has a wider portion extending vertically and a narrower portion extending at an angle to the wider portion to increase the transverse rigidity, the pylon-engaging members being attached at their junction.