alert announcement be-careful beware care careful caution cautionary cautionary-entrance-tape cautionary-tape communicating communication danger Dirt discarded fallen ground informing lookout observant observe pedestrians plastic safety security sign tape warning watch watch-out yellow angle angles appearance barbed-wire barbs barricade barrier deteriorating double fence 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