alarm background copy copyspace danger dangerous death electric electrical electricity hazard notice sign space textures wall warning wood yellow green paint peeling texture current deface England english exclamation mark graffiti Great Britain humor humour London river strong sultana thames advice black handrails high metal metallic mobile non-slip patterned rails ribbed silvery stairs steps alert awareness birds blue sky bright protection road crossing water birds water fowl wildlife aged aging announcement be-careful beware care careful caution communicating communication concern crossing elderly information informing lookout observant old pedestrians risk risks risky road-sign safety security seniors signage signs slow speed-reduction street-sign symbol traffic traffic-flow walk walkers walking warning-sign watch watch-out appropriate-behavior appropriate-behaviour direction directions footpath pathway pedestrian red road share sharing stop cars potential-vehicle-damage road-surface slow-down speed speed-bump speed-hump vehicles