contamination danger graphic green illustration logo pollution radiation radioactive shape sign splatter symbol toxic warning astronomy comet doom fast portent shooting space speed stars universe velocity communicate communication emergency emergency exit escape exit fire fire escape hazard safety advice alert appropriate-behavior appropriate-behaviour behavior behaviour black bright dangerous park reptiles restricted restriction restrictions seen sighting sightings snakes venomous yellow 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 beware drive groove rail railway road rut security street traffic train travel vehicle animal civilisation deer hart nature square stag wild 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 bog England english grasses Great Britain heath heathland landscape marsh Surrey trees atlantic fjord hills islands islets lighthouse norway ocean rock sea sky tower water cycling-prohibited no-bikes no-cycling