Abstract: A modular marker comprised of one or more modular sections that may be secured together to provide a control device for controlling the flow of vehicles or people. The modular marker is comprised of a base member, a cap member, and may include one or more tubular members for extending the height of the marker and for receiving webs, tapes, chains, ropes, wood slats, or metal bars for the construction of a barrier. The modular sections easily interlock with each other and include a security thread to enable secure interlocking of the modular sections. The modular sections include vertical slots to enable easy insertion of preprinted marker tapes or other appropriate cross members to provide rapid construction of a barricade appropriate to the situation in which it is used.