alert announcement be-careful beware black blocked blocked-path care careful caution communicating communication danger detour directing direction go-around informing lookout observant observe pedestrians safety security sign warning watch watch-out yellow awareness blue camera camera-surveillance cctv closed-circuit-tv external information light lighting monitoring observation public security-camera surveillance surveillance-camera under-observation video-camera watched animal animals be careful camel camels car cars drive driving mammal reflective vehicles watch out advice dangerous directions directive drivers red reverse risk risks turn-back warning-sign white community appropriate-behavior appropriate-behaviour concern conditions garden not-allowed not-permitted prohibited prohibition raindrops signs visitors wet cautionary cautionary-entrance-tape cautionary-tape Dirt discarded fallen ground plastic tape