angles arm danger dangerous electricity elevated elevation equipment external height heights high hydraulics lifting machinery on-high perspectives power power-lines power-pole raised raising repair-crew replace replacement replacing risks risky safety service trucks up-high vehicles work workman workmen balance building building-construction building-work climb climbing construction construction-sites construction-work counter-weights crane cranes ladder metal-work pipes railing rails security steel steel-framed straight tall weight weights work-safe appearance architectural-elements architecture barricades barriers bell-tower bells blue cars circular city distinctive glass metal modern motor-cars motor-vehicles movement parked parking round rounded stairs steps street street-scene tourism tourists tower trees vegetation workers building construction building site building work cables chains construction site construction work hoist hoisting hooks metal work safety mesh scaffolding skip steel scaffolding working accident broken damage damaged dangling overturned repairing repairs snapped snapped-off-pole-part surface surfaces trailer building-site cabin construction-site lift light linear lines platforms steel-scaffolding