command-and-response procedure. Ground workers should not treat a warning call as merely informational. When a warning is given, they should immediately identify the hazard and move to a safe location if necessary. Communication becomes especially important around chippers, chainsaws, loaders, stump grinders, and other noisy equipment. A worker operating machinery may not hear a climber’s warning. The job plan should address whether certain equipment must stop during cutting or rigging activities. KEEP GROUND CREWS OUT OF THE LINE OF FIRE Ground workers are frequently ex- posed to hazards when they stand too close to the tree, directly beneath a climber, or within the expected path of material. The desire to work efficiently can lead people to enter the drop zone prematurely to drag brush, coil ropes, or prepare for the next piece. A disciplined crew separates overhead work from ground cleanup whenever pos- sible. Once material has landed and the climber has paused cutting, the ground crew may enter to process debris – but only after confirming that no additional overhead material is being released. Ground workers should also avoid standing at the base of the tree unless their task requires it, and the area has been confirmed safe. The base of the tree can be a high-risk location because it may be directly beneath the climber, rigging points, falling debris, or poten- tial tree failure. When handling ropes, workers should position themselves so they can escape if a load shifts or a rope moves unexpect- edly. They should avoid wrapping ropes around their hands, standing in bights, or positioning themselves where they could be pulled into equipment, struck by a line, or caught by a moving load.
A drop zone is not permanent. It must be reevaluated throughout the job. As branches are removed, the structure of the tree changes. Wind exposure may increase, rigging points may move, and the direction of future cuts may change. The work area may also become more cluttered with brush, logs, ropes, and equipment, creating new trip hazards or blocking escape routes. The crew should reassess the drop zone when: •The climber changes work positions. •The type or size of material being removed changes. •Rigging systems are installed, moved, or modified. •Wind speed or direction changes. •Rain, lightning, ice, or poor visibili- ty develops. •A new worker, client, pedestrian, or vehicle enters the site. •Equipment is repositioned. •The work moves closer to utilities, structures, roads, or public areas. •The tree exhibits unexpected move- ment, cracking, decay, or instability. Stopping briefly to reassess is a profes- sional safety practice, not time wasted. A changing jobsite requires changing controls. SPECIAL CONSIDERATIONS NEAR ROADS, UTILITIES, AND STRUCTURES Some jobs require expanded drop zones and additional controls because the consequences of a falling object may be greater. Roads and Public Access Areas Near roads, crews should account for moving vehicles, cyclists, pedestrians, and parked cars. Traffic-control plans may be necessary, and work should not proceed until the required lane, side- walk, or roadway controls are in place.
Utilities Near utilities, energized conductors create a serious additional hazard. Tree workers must follow applicable electrical safety requirements, maintain required clearances, and involve qualified utility personnel where needed. A drop zone does not eliminate electrical hazards; it is only one part of a larger control strategy. Houses and Other Structures Near houses and other structures, free-dropping material may be inap- propriate. Rigging, controlled lowering, cranes, aerial devices, or alternative work methods may be necessary. The drop zone should include the potential travel path of material if a piece swings, breaks, or is inadvertently released. CONCLUSION Setting up a drop zone is one of the most fundamental parts of safe arboricultural work. It requires more than placing cones beneath a tree. A proper drop zone is based on a thoughtful assessment of fall- ing-object hazards, load paths, work meth- ods, terrain, public access, communication needs, and changing site conditions. ANSI Z133 safety standards emphasize the importance of keeping workers and others clear of exposure areas during tree care operations. Crews should es- tablish exclusion zones before overhead work begins, maintain control of those ar- eas, communicate clearly, and stop work whenever the zone is compromised. A well-managed drop zone is not sim- ply a boundary around the work. It is an active safety system – one that changes with the tree, the crew, and the conditions of the jobsite. ABOUT THE AUTHOR Dane Buell is the past chairman of the ANSI A300 committee and TCIA representative. With over 30 years of experience, Buell holds several leadership roles in the tree care industry.
ADJUST THE DROP ZONE AS WORK PROGRESSES
36 | Fall 2026 ArborTIMES ™
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