Operating safely: travel, overhead hazards and entrapment

Once the platform is inspected and set up, the hazards shift to what happens while it moves. Most entrapment deaths happen during ordinary movements: raising toward a ceiling, driving under a beam, slewing a boom alongside structure. Most struck-by injuries to ground workers happen when a machine travels or swings near people. This lesson covers the operating rules that prevent these events and the supervisor's role in enforcing them.

Entrapment

Entrapment happens when the operator is caught between the platform, usually the guardrail or control box, and an overhead or adjacent object such as a steel beam, joist, pipe, duct, door header or tree limb. The operator, looking down at the control or at the work, does not see the object until their head or back reaches it. As they are pushed forward over the control box, their body may hold the joystick in the direction of travel, so the machine keeps moving and the force increases. Workers have been killed in seconds this way.

Secondary guarding

Secondary guarding is a device on the platform that reduces the risk of an operator being trapped against the controls. It does not replace planning, but it is a valuable engineering control where entrapment risk is high, such as work under steel, ductwork or in plants. Types include:

• pressure-sensing bars or cables above the controls that stop or reverse motion when the operator is pushed onto them;
• proximity or presence sensors that detect an object near the operator and stop motion;
• physical barriers that rise above the control panel and keep space around the operator;
• enhanced control enabling that stops motion if the operator is pushed off a foot switch or lets go of a hold-to-run control.

The current safe use standards expect the user's risk assessment to consider entrapment and whether a machine with secondary guarding is needed. Many large contractors and owners now require it on all booms. Supervisors should never let crews disable or bypass these devices because they cause nuisance stops; repeated stops are a sign that the work is too close to structure.

Travel

Travel is when MEWPs strike people, drop off edges and overturn on obstacles. A few rules cover most of the risk.

• Plan the route and walk it first. Check the floor, slopes, edges, openings, cables and overhead clearance along the whole path.
• Travel stowed wherever possible. Drive elevated only within the manufacturer's limits and where the plan allows.
• Look in the direction of travel. On booms, check which way the drive control moves the machine; if the turntable has rotated, the drive direction may be reversed relative to the operator. Most machines have colour-coded arrows on the chassis and controls for this reason.
• Keep a safe distance from edges, ramps, loading docks and floor openings, and use barriers or wheel stops where the route passes near them.
• Use a spotter in congested areas, when visibility is limited or when travelling near people, vehicles or structure.
• Keep ground workers out of the travel path and the swing radius of the boom and counterweight.

Safe operating practices on the platform

Several platform rules come directly from incident investigations. They appear in the regulations, the standards and every manufacturer's manual.

Working near other activity

MEWPs often work in busy areas. On construction sites, they share space with forklifts, telehandlers, cranes, delivery trucks and other trades. In plants and warehouses, they work near forklifts, conveyors and pedestrians. Coordination matters: the MEWP's work area should be shown on the site plan or daily coordination board, other trades told when and where it will work, and vehicle routes adjusted or controlled. HSE-218 covers traffic management in warehouses and HSE-219 covers coordination with cranes; the same principles apply.

The exclusion zone around and beneath the platform protects people from falling objects and from the moving machine. Its size should allow for the platform's reach and swing and the height from which objects could fall. Lesson 10 covers dropped objects in more detail.

Spotters and communication

A spotter is only useful if the operator can see or hear them and both know the signals. Agree before work starts on how the spotter will communicate: radio on a dedicated channel, voice when close enough, or hand signals. Standard MEWP signals are simple, such as stop, emergency stop, raise, lower, move toward me and move away, but they must be agreed in advance. The spotter should stand where they can see both the hazard and the operator, out of the travel path and the tail swing, and their only task while spotting should be spotting.

Fatigue and distraction

Operating a MEWP needs constant attention to the controls, the overhead and the surroundings. Long shifts, repetitive tasks, heat and phone use all reduce that attention. Plan breaks, rotate operators on long repetitive tasks, and set a rule that phones are not used while the platform moves. Many entrapment incidents involve an operator who had done the same movement dozens of times that day and stopped looking up.

Travel between work locations

Moving a MEWP between work locations is when many crews relax, and it is when many incidents happen. The machine may cross areas the site assessment did not cover, such as a gravel strip between two buildings, a ramp into a loading bay, or a corridor with low sprinkler pipes. Before moving, lower the platform fully, check the new route, and walk it if it has not been checked. Travel at a walking pace, watch for pedestrians at blind corners, and keep the platform lowered until the machine is set up at the new location and the overhead clearance has been checked again.

On construction sites, MEWPs are often loaded and unloaded from trailers. That task has its own hazards, such as ramps that shift, winches, and machines that slide on wet decks, and it should be done only by people trained for it, following the manufacturer's loading instructions.