building escape fire fire escape ladder safety stairs communicate communication danger emergency emergency exit exit hazard sign warning helix red spiral Canary Wharf high rise steps black color colour silhouette sky stair step clear keep metal text architecture car park night doors fire door keep clear no obstruction security elements England english external Great Britain white blue ladders rusted San Francisco windows construction corkscrew stairs escape route escape way fire exit flight of winding stairs grate grated helical shape shapes spiral stair spiral staircase staircase wentletrap
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