abstract background black bumps caution coloured design equipment floor grunge health no non non-skid non-slip object occupational outdoor outside pad pads path pathway pattern pavers paving plastic prevent prevention rubber safety shape shiny sidewalk skid slip slipping stone street surface texture traction used walkway Dirt yellow aging backgrounds broken brown built cement concrete cracked dirty effect grey history level material obsolete old process revival ridged rough strip urban view wall weathered white wreck blocks feature slabs steps. circles advice danger handrails high metal metallic mobile patterned rails ribbed sign silvery stairs steps warning diamond-patterned inside interior steel strong sturdy deck decking fishmonk flat grain groove grooved grooves line lined lines non slip outdoors parallel patio patios plane planed plank planks strips wood angled angles appearance color colorful colour colourful Designs detailed detailing distinctive footpath gray ground pavement shaped shapes stones stonework surfaces textured textures