A base for a temporary barrier has a spigot or socket to receive a fencing pole or to cooperate with a plastics fencing panel. The base has a support portion of plastics material on which is provided the spigot or socket. A pair of stabilizing members of plastics material of low profile extending in opposite directions from the support portion. A stiffening member is connected to each stabilizing member and extends horizontally from adjacent the remote end of one stabilizing member to adjacent the remote end of the other stabilizing member. In one form a pair of metal tubes extend upwardly and are connected to a hollow metal portion through which the stiffening member passes. In another form, a plastics portion projects upwardly and defines a socket.