blue eight halt octagon pole post red sign signpost signs sky stop stopped sundtraffic traffic white posts signposts decree keep right round cross no parking prohibitory roadsign roadsigns stopping street isolated danger don't go past this sign forbidden not beyond this point pedestrians stop here pictogram traffic sign warning back car closed drive end enter not road stand transport wait chinese clever knowledge letter mandatory nonsence rule rules strange ting understand understandable cars go lights safety signal signs full stop Stop light advisory avenue calle cityscape crossroad crossroads highway intersection lane object roads roadway stop sign street marker street scene streets activism bicycling biking driving graffiti road signs stop signs