Exclusion zones around lifting operations exist to keep people out of the arc of harm when loads move, slew and are rigged. The risks aren’t limited to a dropped hook; think swing radius, outrigger and counterweight sweep, trapped pinch points, and the unpredictable path a load can take in wind. Strong zones are planned, measured, physically controlled and stewarded. Weak zones are tape, guesswork and “we’ll be quick”.
TL;DR
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– Plot zones to cover load path, swing radius, outrigger footprint and a sensible collapse allowance; fence the lot, not just the hook path.
– Use hard barriers, trained marshals and controlled entry points; “just passing through” is not an exception.
– Sequence deliveries and nearby works to deconflict the area; keep housekeeping sharp and use tag lines where needed.
– Pause for wind, poor visibility or crowd pressure; if the zone can’t be kept sterile, stand the lift down.
What the exclusion zone really needs to cover
/> An effective zone accounts for everything that can hit, crush or trap. That includes the primary load path, where the load will slew, and the space taken up by outriggers and counterweights. It also considers the potential collapse radius of a mobile crane if the ground gives way or the crane de-rigs unexpectedly. A sensible plan builds in a secondary “no linger” buffer that captures rebound, overswing and unplanned movements if the wind kicks up. Don’t forget overhead risks: gantries, balconies, scaffold lifts, facade rigs and live power lines. If the public or neighbours are close, the plan should show how the zone interfaces with footpaths, shopfronts and site gates.
Translating the plan to the ground
/> On busy UK sites the line on the drawing is only the start. Walk the site and anchor the zone edges to real features: hoarding, containers, Jersey barriers, scaffold bays. Create one or two controlled entry points and put a competent marshal on them—ideally with radio comms to the crane supervisor and slinger/signallers. Use hard barriers where people would otherwise cut corners; tape is a last resort and won’t stop a distracted pedestrian. Plan a secondary route to keep trades and deliveries moving around, not through, the exclusion zone. Where lifts cross doorways, cores or stair towers, post a spotter at each potential “pop-out” point to hold traffic. Sequence the programme to stop nearby noisy, distracting or vibration-heavy works that could interfere with the lift team or push people into the zone.
Quick set-up checklist for the lift exclusion zone
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– Mark primary and secondary boundaries that cover slewing, outrigger sweep and likely collapse radius.
– Install hard barriers with two controlled entry points maximum; brief and post named marshals.
– Clear housekeeping inside the zone—no pallets, bins, loose materials, or trailing leads.
– Agree a single radio channel and plain-language stop words for crane team and marshals.
– Coordinate deliveries and pedestrian routes to avoid the zone during rig, lift and de-rig.
– Confirm ground bearing and any temporary works affecting outrigger mats or crane pads.
– Verify weather, visibility and lighting levels suit the lift; have a hold/stand-down trigger.
Scenario: weekend mobile crane glass swap on a city-centre refurbishment
/> A mobile crane is booked for Saturday to replace three glazed units on the fifth floor of a high street office refurb. The lift plan shows the crane pad in a loading bay, counterweights slewing across the site footpath, and the load path passing an active scaffold lift. The AP agrees a primary zone around the crane and load path, plus a secondary buffer that pushes pedestrians to the opposite pavement using chapter-8 barriers and stewards. Security close the nearest site gate and re-route fit-out operatives to a different stair during the lift window. Twenty minutes before the first pick, wind gusts increase and passing shoppers gather at the corner. The crane supervisor holds the start, adds an extra steward at the pinch point and waits for the gusts to settle. The lift proceeds only once the zone is sterile; rigging and de-rigging are stewarded as strictly as the actual lifts.
Pitfalls and fixes on the ground
/> Barriers that don’t match the risk lead to drift. Use solid barriers and weighted bases at the edges where the public press close; cones and tape invite shortcuts. If the zone touches the carriageway, bring traffic management into the plan and brief it like any other interface, not as an afterthought. Blind corners and doorways are classic leak points—position marshals and add simple “Do Not Enter – Lift in Progress” boards at eye level.
“Essential” people multiply once the hook lifts. Limit the zone to the crane team plus anyone strictly needed for landing the load, and make one person responsible for counting people in and out. Housekeeping kills a lot of grief: loose timber, offcuts and strapping inside the zone become trip points and airborne debris. Finally, treat rigging and de-rigging as part of the lift, with the same zoning and supervision—they create just as many crushing and struck-by hazards.
Common mistakes when marking and managing lift zones
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Letting “essential” people inside
Once you make one exception, the zone fills up. Control entry, log who is inside, and send observers to a safe vantage point.
# Setting the zone too tight
/> Drawing the line at the hook path ignores swing, rebound and counterweight sweep. Build in a practical buffer you can actually enforce.
# Mixing traffic routes with the lift envelope
/> Trying to keep a walkway open through the zone invites conflict. Re-route entirely for the lift window and signpost it clearly.
# Ignoring rigging and de-rigging periods
/> Most crushes and foot injuries occur when hooking on or stripping gear. Apply the same zone and supervision to these phases.
People and comms that make the zone work
/> Clear roles help the zone hold. The AP produces and briefs the plan; the crane supervisor controls the lift; slinger/signallers manage the hook; marshals own the boundaries and entries. Put them on one radio channel with agreed, unambiguous commands—no hand signals mixed with vague radio chatter. Give marshals explicit stop authority and support them when they use it. Brief the wider workforce and neighbours on times, routes and what the barriers mean. Keep a log of holds and restarts so the team can review what triggered them.
Paperwork that earns its keep
/> A practical lift sketch with the zone, barriers, entry points and steward positions drawn to known site features beats pages of text. A short permit or lift authorisation helps freeze the plan and confirm interfaces, especially where traffic management or scaffold alterations are needed. Toolbox talks should use the sketch, not generic slides. If the set-up changes mid-shift, record the reason and the new boundary so the team isn’t working from memory.
Wind, light and public interface: when to step back
/> Manufacturer limits and site rules set the weather envelope, but judgement still matters. If tag lines stop working, radios struggle in gust noise, or the load begins to weathercock, call a hold. Night or winter lifts demand lighting that avoids glare for the crane operator and gives marshals clear sightlines at entries and landing zones. When public pressure increases—match days, market hours, school turn-out—either bolster stewarding and barriers or move the lift window.
# Priorities before the next booked lift slot
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– Map the zone onto fixed site features and pre-position the right barriers and mats.
– Brief marshals, crane team and neighbours with a simple annotated plan and timings.
– Stage landing areas so loads don’t linger on the hook while people make space.
– Ring-fence a diversion route that keeps pedestrians and trades well clear without confusion.
– Rehearse stop signals and a hold/restart routine so a pause doesn’t derail the day.
If you can’t keep the zone sterile, you don’t have a safe lift—no programme pressure changes that. Expect more attention on exclusion discipline where sites interface with the public and live workplaces; competence drift shows quickest at the barriers.
FAQ
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How big should an exclusion zone be around a crane?
Size it to cover the full slewing envelope, the outrigger and counterweight sweep, and a sensible allowance for potential collapse. Add a secondary buffer where the public or other trades operate close by. Use supplier information and the lift plan to guide margins rather than guesswork.
# Do cones and tape count as a proper barrier?
/> Cones and tape are weak controls and are easily stepped over or blown down. Use solid, weighted barriers or heras panels where people might approach, reserving tape for inner markings only. If the public are nearby, treat the boundary like street works with appropriate barrier classes.
# Who is allowed inside the zone during a lift?
/> Only the crane team and those strictly needed for slinging, signalling and landing the load should be inside. Everyone else watches from a safe area outside the boundary. Control access through one or two entry points and make one person accountable for headcount.
# How do we manage zones for tower cranes lifting across a live site?
/> Plan floor-by-floor holds on routes under the load path and post marshals at doorways and cores. Time lifts to quieter periods and brief affected trades at the daily coordination meeting. If an area cannot be kept sterile during a pick, reschedule or find an alternative landing sequence.
# When should weather stop a lift?
/> Follow manufacturer limits and your site policy, but also consider how the team is coping with conditions on the ground. If tag lines are ineffective, comms are degraded, or the load begins to sail or spin unpredictably, stand the lift down and reassess. Lighting and visibility should allow clear sight of the hook and marshals at all times.
