construction construction machinery construction people construction site crane crew heavy duty heavy objects HSE lifting machines mobile crane operating people at work safety safety precaution supervising working auto car container cutout drill drilling elevator isolated lift lorry machine mobile path transport travel truck weight boom buildings cambodia cap changing-a-globe city-street-light clouds danger electricity heavy-duty height high hook light lighting mobile-crane open overhead public-utility risk risky sky steel-cables street-light telescopic-boom up-above wires wiring workman basket blue cradle elevated elevation empty equipment escape exploration extricate fire firemen heaven hoist hydraulic job ladder machinery mans mechanical men occupation people platform practice profession rescue rise save service step team teamwork train white work aerial-work-platform articulating-boom-lift basket-crane boom-lift cage cherry-picker cherrypicker compact dangerous elevated-work-platform extension hydraladder hydraulic-arm hydraulic-lifting-system hydraulic-platform hydraulics looking-up maintenance man-lift manoeuvrable mobile-hydraulic-platform nifty-lifter railing rails raised raised-platform tall trees up-high workplatform Harness men-at-work roof roof-work roofing safety-harness self-propelled workmen