alert background barricade barrier caution color cone construct construction cutout danger design direction drive equipment forbidden highway isolated line marker marking object obstacle orange plastic red reflective repair road safety security sign signal site speed stop street striped stripes symbol traffic transportation travel under warning white work access armed authorities authority availability available badges barriers cars communicating communication control deployment flashing-lights law law-&-order lights motor-bikes National-Day on-duty on-the-job order patrols police police-vehicles power presence regulations responsible Singapore symbols traffic-control uniforms vehicles weapons abstract bumps coloured Dirt floor grunge health no non non-skid non-slip occupational outdoor outside pad pads path pathway pattern pavers paving prevent prevention rubber shape shiny sidewalk skid slip slipping stone surface texture traction used walkway yellow abandoned aging agricultural appearances brown colors colours corroded corrosion damage damaged dark decay derelict deteriorating deterioration discarded discoloration discolouration disrepair dumped exposed farm farming iron machinery machines metal neglect neglected old rough rural rust rusty surfaces textures unwanted variety wearing weathered weathering wheels active activities adventure adventure-playground children children’s-playground climbing climbing-nets climbing-ropes families fun ground kids leisure light nets netting open park parkland peaceful perspective plants playground playing posts public quiet relaxing roped ropes secure shade shadows sunlight sunshine tranquil trees views