caution chain link chainlink construction danger fence letters tape type typography warn warning worksite yellow barrier barrier tape blocking off border caution tape closed closed areal closing off cordon dangerous area delimitation do not pass no passing through prevention red and white sheltered area stop warning tape alert announcement be-careful beware care careful cautionary cautionary-entrance-tape cautionary-tape communicating communication Dirt discarded fallen ground informing lookout observant observe pedestrians plastic safety security sign watch watch-out angle angles appearance barbed-wire barbs barricade deteriorating double fencing gray grey light metal old plastic-tape protect protection protective razor-wire restraint rust rusting rusty secure security-fence sharp silvery spirals strands texture textures twists wire