city cityscape post pylon road roadsign sign street car town tram tramway warning circle crossing hoop hula oval pedestrian ring toy walker yellow beware bus car danger drive safety security street traffic transportation travel vehicle animal black cat civilisation nature shape square wild dog elephant ahead construction orange sundtraffic us usa work canal caution communicate communication design drown graphic icon info information lake pond pool river signs triangle water advice alert announcement appropriate-behavior appropriate-behaviour aware awareness care careful colors colours communicating concern considerate consideration directions Dirt dirty garbage green informing limitations limited listen lookout not-allowed not-permitted permission-denied prohibited prohibition risk risks rubbish unwanted warning-sign waste waste-disposal watch-out white be-careful dangerous double-lines island observant pedestrians reflective refuge risky road-sign share sharing small-traffic-island traffic-flow traffic-island walk walkers walking watch