chain saw cherry picker danger ear muffs extension Harness height helmet looking down lopping men men at work noise reduction Noisy pruning raised platform safety safety harness tall tall tree tree tree loppers tree lopping up high work workmen professional council cricket pitch flattened flattening grass green machine oval pitch playing field preparation preparing reserve rolled roller rolling sport sporting sporting field worker aerial-work-platform articulating-boom-lift basket-crane boom-lift cage cherry-picker compact dangerous elevated-work-platform high hydraladder hydraulic-lifting-system hydraulic-platform hydraulics lift maintenance man-lift manoeuvrable men-at-work mobile-hydraulic-platform nifty-lifter railing rails raised-platform roof roof-work roofing safety-harness self-propelled up-high charity helpers level levelling levels not-for-profit paving paving slabs preparing sand rail rake reflections sand shovel slabs steps voluntary volunteer workers volunteers workers activity at beware blank blue build building caution construction dig digging hazard industrial industry information man manual metal repair repairing road roadworks rope sign site street symbol triangle urban wall warning white wood works