ban danger prohibition sign staff only trespassers warning zoo caution electric electrical signs words arab arabic cutout isolated roadsign roadsigns cross crossing pedestrian pedestrians road street walk zebra advice alert announcement beware black bright camera cctv communicating communication constant continuous information informing lookout notice observation observe safety security surveillance under-observation video warning-sign watch watched yellow crossroads junction minor side side-road sideways appropriate behavior appropriate behaviour be careful care careful cars concern dangerous directions listen Look looking observant risk risks trams warning sign watch out appropriate-behavior appropriate-behaviour be-careful Cacti cactus cactus-garden conditions not-allowed not-permitted prohibited red white