alert avoid barricade barrier build caution color cone construct construction danger direction drive equipment forbidden highway line marker marking object obstacle orange orientation pavement plastic red reflective repair road roadworks safety security sign signal site speed stop street striped stripes symbol traffic transportation travel under construction urban warning way white work advice announcement appropriate-behavior appropriate-behaviour be-careful beware black care careful cars cautious communicating communication concern conditions dangerous directions informing Look looking lookout observant risk risks road-conditions signs slippage slippery slow slow-down speed-reduction vehicles warning-sign watch watch-out wet yellow aged aging crossing elderly information old pedestrians risky road-sign seniors signage street-sign traffic-flow walk walkers walking activity beach churned-up colors colours conservation conserving curved curving damage damaged damaging environment environmentally-unfriendly foot-prints grainy gray grey impressed impressions imprinted imprints indented light marked marks off-road-driving over-printed patterns prints rough sand soft-sand surface surfaced surfaces tangled terrain texture textured textures tire-tracks track tracks tyre-tracks vehicle-tracks wild car corner distorted driver mirror reflection vehicle chains fire hydrant prevention pump accident fall hexagon hill hillside lichen mesh metal net netting pattern prevent rock rockfall secure wire