abstract angles appearance architectural architecture basic concrete cracked cracks down edge edged edges exterior external going-down gray grey lined lines outside rough rugged safety secure shape shaped solid stairs steep steps surface surfaces surfacing texture textured textures thick advice alert appropriate-behavior appropriate-behaviour avoid be-careful below-ground black cable care careful caution communicating communication concern digging digging-dangers optical-fibre-cable potential risk risks risky sign signs stay-clear warned warning warning-sign yellow access-denied advising automobiles behave communicate denied directive entry-denied entry-prohibited information informing no-access no-entry not-allowed not-permitted permission-denied prohibited prohibition red restricted restriction restrictions vehicles white cautious danger dangerous directions green inform machinery machines prohibitions protect protection rules 3D background bond chain chainlink concept connection creation design detail fence fill garden graphic grid illustration industrial industry isolated line link metallic pattern power prison rust security steel strength strong symbol system together building capping cleaning cover covered covering dangers ear protection height high high-pressure improvement maintenance pressure pressure-cleaning renovating renovation repairs restoration restoring roof roof-area roofing rooftop skies sky spray sunlight sunshine tiles tiling tools tough water wet work workman attraction beacon beautiful blue coast coastal coastline harbor hope icon island landmark landscape light lighthouse maritime nautical navigation night ocean rock sea seascape shipping shore tower travel vacation vector Australia ballast bolt brown bush clips country crossing day Dirt grass horizontal nature outdoor photo photography pine railroad railway rural scenery season sleepers straight timber track train transport tree winter big brother camera cameras cash enforce enforcement fast fifty fine fishmonk flash forty law legal limit Look picture police road roads safe seventy sixty speed speeding spy thirty traffic uk vehicle warn watch ban banned no-golf signage announcement beware cctv center centre closed-circuit-tv extensive lookout monitoring monitors notice notification observation observe surveillance thorough under-observation video watched