The expandable band is used to secure a sealing element within a generally cylindrical structure, such as a pipe or manhole, or other round hole. The device is removably installed onto the rear window, mounted on the rear deck, or mounted on the trunk or top of the vehicle when in use and has a plurality of highly visible flashing lights configured in the shape of an arrow pointing in the direction leading away from a traffic blockage. The strap is appropriately sized to insert through one or both of two cinch slots of a self-laminating hang tag which may be printed with patient information and separated from a sheetlet or page sized business form processed through a printer for imaging of patient information thereon. The contaminated material may include oily waste, asbestos fibers, andor at least one of a chlorinated solvent, a polychlorinated biphenyl, a dioxin, a furan and a polynuclear aromatic hydrocarbon.