board car overtakin prohibited sign street traffic ahead blue pole post posts red right signpost signposts signs sky sundtraffic turn warning yellow eight halt octagon stop stopped white appropriate-behavior appropriate-behaviour black communicating communication denied directive discrimination exception exceptional exceptions information informing limited limited-parking no-parking not-allowed not-permitted parking permission-denied prohibition restricted restrictions road-sign roadside special-parking street-sign traffic-flow about circle round roundabout communicate grass own ownership park parking sign parking space sign post street scene 70 limit limits road speed speedlimit steel detour diversion map maps roads roadsign streets traffic sign transport transportation man ped pedestrian pedxing walking xing bike cloud clouds cycle allowed not overtake overtaking pass passing