black danger hexagon pictogram rail railway red security sign track transport yellow bus city green h light road signalling street triangle instructions no entry probibit restrictions rules signage signs sky stop advice alert announcement be-careful beware car care careful cars communicating communication dangerous directions directive drivers informing lookout observe reverse risk risks safety turn-back vehicles warning warning-sign watch watch-out white appropriate-behavior appropriate-behaviour blue caution concern conditions garden not-allowed not-permitted prohibited prohibition raindrops visitors wet all seeing eye deity eye fascia god metal roadsign singboard cityscape post pylon street car town tram tramway background blank copyspace corroded decay faded grunge paint scratched urban change diversion left line lines right roadsigns turn turning achtung bend exclamation exclamation mark expletive interjection islet mark warn