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