A forklift is moving through a work area while nearby LPG cylinders are being degassed. Both activities are normal parts of the operation. But when these two tasks occurred in the same space, the escaping gas ignited — causing an explosion that seriously injured the forklift driver.

This was the situation highlighted in a recent WorkSafe investigation.

Individually, both activities were legitimate tasks. But together, they created an ignition risk that led to a serious incident.

How hazards emerge The Insight

Many serious incidents don’t occur because a task itself is unsafe. They occur because two normal activities interact in ways that were never intended.

When tasks overlap in the same space or at the same time, new hazards can emerge. Hazards that may not exist when each activity is considered in isolation.

The “Two-Task Clash”

At Employ Health, we sometimes refer to this type of situation as a Two-Task Clash.

A Two-Task Clash occurs when two normal work activities interact in the same space or time, creating a risk that doesn’t exist when each task is performed independently.

Examples can include:

  • forklift traffic moving through manual handling areas
  • cleaning activities occurring while production continues
  • maintenance work happening beside active production lines

Individually, these tasks are safe and necessary. But when they overlap, they can create new hazards that are easy to miss.

Everyday Examples on Industrial Sites

This type of risk is common in routine operations.

Busy warehouse with multiple workers and forklifts showing overlapping work activities and safety risks

Forklift traffic and manual handling

Workers handling product may share the same space as forklift traffic. Workers may rush lifts, twist awkwardly, or adjust their movements to stay clear of vehicles.

Cleaning while production continues

Sanitation teams may begin cleaning while production is still running. Wet floors, hoses, and cleaning chemicals can disrupt normal movement patterns and increase slip risks.

Maintenance beside active production

Maintenance teams often repair equipment while surrounding operations continue. Temporary removal of guards, tools in walkways, or workers navigating around repair work can introduce hazards that weren’t present during normal production.

In each case, the tasks themselves are legitimate.

The risk emerges when those activities interact in the same space or at the same time.

Forklift operating in busy warehouse with stacked pallets and workers highlighting complex work environment interactions

What On-Site Physios Often Notice

At Employ Health, our physiotherapists work directly on-site within production environments.

While we support injury management and treatment, a large part of our role is understanding how work places physical demands on the body in real operational environments.

Because we regularly observe work on the floor, we often see how different activities interact across a normal shift. It’s common to see workers subtly adapting their movements to navigate surrounding work:

  • stepping around hoses, pallets, or equipment
  • adjusting lifting technique due to limited space
  • rushing tasks to stay clear of nearby vehicles

These adjustments may seem minor, but over time they can increase both musculoskeletal injury risk and the likelihood of an incident.

Often the issue isn’t the task itself — it’s what else is happening around it.

 

Warehouse supervisor wearing safety vest and helmet inspecting stock with clipboard during site walk

Try a “Two-Task Clash” Site Walk This Week

Here’s a simple challenge for this week.

During your next site walk, focus on identifying where two normal activities could clash. Ask yourself:

  • Are two activities happening in the same space that were never designed to occur together?
  • Are workers exposed to hazards created by another team’s work?
  • Are workers modifying how they perform tasks because of surrounding activity?
  • Are we relying on workers to “be careful” rather than separating the activities?
  • Has workflow gradually changed over time, causing tasks that were once separate to overlap?

Even identifying one Two-Task Clash can highlight an opportunity to reduce risk through simple changes such as separating tasks, adjusting workflow, or improving traffic management.

 

The Leadership Takeaway

Serious incidents are sometimes associated with complex failures or technical faults. However, many occur because of much simpler factors.

A change in workflow.

A shared workspace.

Two normal tasks happening at the same time.

By regularly observing how work is actually performed and how different activities interact. Leaders can often identify these risks early and prevent incidents before they occur.

Because on most sites, the biggest hazards don’t come from the task itself. They come from what else is happening around it.

Sometimes the most valuable safety insights come simply from watching how work actually happens.

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