animal beware bird danger drive duck nature road safety security sign street traffic travel vehicle warning yellow black civilisation hare rabbit shape square wild attention falling rocks germany isolated mountains pictogram rock fall rock slide rockfall stones contamination graphic green illustration logo pollution radiation radioactive splatter symbol toxic astronomy comet doom fast portent shooting space speed stars universe velocity communicate communication emergency emergency exit escape exit fire fire escape hazard advice alert appropriate-behavior appropriate-behaviour behavior behaviour bright dangerous park reptiles restricted restriction restrictions seen sighting sightings snakes venomous access-denied avoid care communicating concern damage demolition denied destruction directions hazardous keep-out message no-access no-entry not-allowed not-permitted permission-denied prohibited prohibition red requirements risk risks risky unwanted warning-sign white groove rail railway rut train deer hart stag access-limited announcement ban banned be-careful bicycles-prohibited bylaws information informing law legal no-wheels parking pedestrian-care pedestrian-safety prohibitions rollerskates-prohibited rules signs skateboards-prohibited watch watch-out