bare barefoot foot no prohibition roadsign shoe shoes sign warning wear attention danger germany isolated pictogram safety traffic uneven road advice alert announcement appropriate-behavior appropriate-behaviour be-careful beware care careful carpark caution communicating communication concern dangerous directions informing Look looking lookout observant pedestrian pedestrian-speed red reflective risk risks shared-area signs slow slow-down speed warning-sign watch watch-out white behave behavior behaviour black communicate information large-vehicles limitations limited restricted restriction restrictions reversal reversing risky trucks vehicles don't go past this sign forbidden not beyond this point pedestrians stop here stop traffic sign advising be-prepared-to-stop cars hazard limited-access motorcars no-overtaking no-passing readiness ready road-sign roadwork workers workmen cycling incline slope steep track protect safeguard security theft risk ducks letter road stone writing bug nature