caution close communicating communication door escape exit fire fire-door information informing keep-clear keep-closed no-obstruction red risk risks risky safety security warning wording words architecture building extinguisher fire extinguisher hotel house lamp Nyberg staircase stairs doors fire door keep clear no obstruction black circle knob old open porto Portugal sun brigade chimney gate home huge ladek Poland roof sky sole tile wall yellow zdroj anonymous blank blue danger estate factory fence industrial industry ladder metal modern perspective railings stair unit window bucket England english Great Britain green outbuilding private railway rural slate station tiles weatherboard wooden yorkshire arrow dangerous directing direction directions doorway emergency emergency exit exiting guide help icon indoor instruction leaving life man path protection run running save sign signs symbol urgency