advice alert appropriate-behavior appropriate-behaviour black care careful caution communicate communication concern information informing large-vehicles less-noise limitations limited message noise-reduction noise-restrictions Noisy outback residential-area restricted restriction restrictions risk risks risky rural-area semi-trailers sign signs symbols town-boundaries trailers transport transportation trucking trucks vehicles warning warning-sign watch watch-out words chain saw cherry picker danger ear muffs extension Harness height looking down lopping men men at work noise reduction pruning raised platform safety safety harness tall tall tree tree up high workmen helmet tree loppers tree lopping work professional arboriculturist arborist ascended Australia balancing belt chainsaw climber climbing cutting dangerous descending ear-muffs expertise high lines lop man-at-work removal remove removed ropes safety-glasses safety-harness sawing secured suspended suspension tall-tree tree-lopper tree-lopping tree-management tree-surgeon trees up-high workman amphibian animal frog green rocks water