struck hazards with aerial lifts

Aerial lifts and mobile elevating work platforms present significant struck-by and collision hazards from passing vehicles, moving equipment, overhead obstructions, power lines, and falling objects. Source materials identify major hazards including contact with overhead obstructions, objects falling from the lift and striking persons below, workers being ejected when lifts are struck, and operators being pinned between the basket and a structure. Falls, electrocutions, and collapses/tip-overs are also leading causes of serious injury and death, often occurring when lifts are improperly positioned, moved, overloaded, or used outside manufacturer limits. [1] [4] [3]

Key struck-by and collision exposures:

• Workers in elevated platforms being struck by passing traffic or mobile equipment
• Workers below being struck by dropped tools, materials, or debris from the platform
• Operators being pinned or crushed against beams, structural members, or other overhead obstructions during positioning
• Workers being ejected from the platform when the lift is hit by a vehicle or object
• Ground workers being exposed to lift travel, backing, swing radius, outriggers, and blind spots

[2] [4] [1] A proper hazard assessment must be completed before setup and continuously updated during the job. The operator should survey the work area for unstable ground, holes, drop-offs, debris, overhead obstructions, electrical conductors, weather, and unauthorized persons. A job hazard analysis is especially important where lifts are used near roadways, moving equipment, structural steel, doorways, sprinkler piping, or other overhead pinch points. The assessment should also identify whether temporary traffic control, barricades, spotters, exclusion zones, or alternate equipment are needed. [1] [2] [6]

Safe operating procedures for struck-by prevention should include:

• Use the lift only for its intended purpose and follow the manufacturer’s operating instructions and load limits
• Inspect the lift before each shift; remove defective equipment from service until repaired by a qualified person
• Set up on firm, stable ground; use outriggers/stabilizers as required; set brakes and chock wheels on inclines
• Close gates or chains, stand firmly on the platform floor, and never climb on rails or use ladders, planks, boxes, or buckets to gain extra height
• Do not place materials on guardrails or allow loads to extend beyond platform confines unless specifically approved by the manufacturer
• Do not move an elevated lift with workers on the platform unless the equipment is specifically designed for that operation
• Establish and clearly mark danger zones below and around the lift to keep pedestrians and other workers out of the struck-by area
• Use a spotter or ground person when visibility is limited, when backing or positioning near hazards, or when maintaining clearance from obstructions and energized lines
• Avoid operating outdoors in high winds or inclement weather

[1] [4] [8] [4] [4] [3] Where lifts are exposed to traffic or moving equipment, struck-by prevention depends on separating the work area from vehicle paths. Use temporary traffic controls, warning signs, cones, barricades, flagging, flashing lights, and roped-off areas as needed. If work is performed over or adjacent to a roadway, the work zone should be planned using the applicable traffic control manual so traffic is warned, redirected, and kept out of the activity area. Workers in the road right-of-way should wear high-visibility apparel, and personnel with traffic-control duties must be trained. [2] [2] [2] [5] [5]

Overhead obstruction and caught-between hazards are a major cause of fatal injury. Operators must look above, beside, and behind the platform before raising, extending, rotating, or traveling. Extra caution is needed near beams, joists, door headers, sprinkler piping, utility lines, and other fixed structures. A ground person can help monitor clearances, and operators should reposition slowly to avoid pinning themselves between the basket and an overhead member. Control guarding and good equipment condition also matter because unintended movement or control malfunction can contribute to entrapment. [3] [4] [11]

Falling-object prevention requires controlling both what is carried on the platform and who is allowed below it. Secure tools and materials, keep loads within rated capacity, do not hang equipment off rails, and do not use the lift as a crane unless it is designed for that purpose. Establish drop zones or exclusion zones beneath overhead work, mark them clearly, and train workers to stay clear until the area is safe. Hard hats should be used where overhead falling-object hazards exist. [1] [7] [7] [8]

For power-line and overhead electrical hazards, maintain at least a 10-foot minimum clearance for non-qualified workers and treat all overhead lines as energized. If the lift could enter the danger zone, use a spotter, insulating protection, de-energization, or other controls required for the task. Uninsulated aerial lifts should not be used next to power lines, and only qualified personnel should work closer than the minimum approach distance under the applicable electrical standards. [4] [6] [10] [9]

Relevant OSHA and related regulatory expectations for MEWP struck-by prevention include training operators, following manufacturer instructions, inspecting equipment before use, protecting workers from falls, and controlling traffic and moving-equipment exposure. OSHA construction rules for aerial lifts are commonly referenced through 29 CFR 1926.453, while roadway operations rely on traffic-control requirements such as MUTCD-based temporary traffic control. State-plan materials in the source set also require harnesses and lanyards attached to manufacturer-approved anchor points on boom-supported platforms, and require warnings, barricades, or other controls where vehicles or moving equipment are present. [4] [12] [2] [2]

Practical struck-by injury prevention checklist for MEWPs:

• Train and authorize operators on the specific make/model and hazards of the job
• Perform and document pre-use inspections and remove defective lifts from service
• Complete a job hazard analysis and site survey before setup
• Separate the lift from traffic using TTC, barricades, cones, signs, and flaggers where needed
• Create exclusion/drop zones below and around the platform
• Use high-visibility clothing when exposed to vehicle traffic
• Assign a spotter/ground person for backing, positioning, overhead clearance, and power-line clearance when needed
• Maintain safe clearance from overhead obstructions and energized lines
• Keep gates closed and use required fall protection tied to approved anchor points
• Do not overload the platform, store materials on rails, or use the lift as a crane unless designed for that purpose
• Do not move elevated platforms unless the equipment is designed for it and conditions allow safe travel
• Stop work in high winds, poor visibility, unstable ground, or when unauthorized persons enter the hazard zone

[1] [1] [2] [5] [3]