... a greater visual warning, with blackbold lettering on Yellow film, Red film, Blue film, Orange film and others. 3) Size: Thicknesses ... request) Other name: Underground warning tape, Non-detectable tapes, Detectable warning tape,Police Tape, Parking barrier, traffic warning tape, Quarantining tape, BarricadeTapes, Caution Tapes, Hazard Tapes. Caution Tape