advice alert appropriate behavior appropriate behaviour black care concern directions no entry prohibited prohibition red rust rusty sign unwanted warning warning sign weathered white abstract across background block circle concept design enter entry home horizontal illustration improvement interior no pole post rectangle roadsign roadsigns shape signs straight stripe striped stripy symbol access-denied access-limited appropriate-behavior appropriate-behaviour behave behavior behaviour blue communicate communication denied don’t limited-access no-access no-entry no-pedestrians not-allowed not-permitted pedestrian permission-denied restricted restriction restrictions unauthorised unauthorized advising business closed commerce communicating expression information informing lettering letters message not-open shop shop-sign silver wording words ban banned barrier dutch enrty-denied Gangplank mixed pier rope ropes sealed ship symbols caution cautious keep-out keep-to-path safety fight flight avoid damage danger dangerous demolition destruction hazard hazardous requirements risk risks risky warning-sign animal be-careful beware canine canine-guard dog guard-dog lookout mammal observe security warned watch watch-out fence fencing mesh wire-mesh