barrier barrier tape blocking off border caution tape closed closed areal closing off cordon danger dangerous area delimitation do not pass no passing through prevention red and white sheltered area stop warning warning tape angle angles appearance barbed-wire barbs barricade caution cautionary-tape deteriorating double fence fencing gray grey light metal old plastic plastic-tape protect protection protective razor-wire restraint rust rusting rusty secure security security-fence sharp silvery spirals strands tape texture textures twists wire barbed-tape injury razor-sharp