Toolbox Talk – Heavy Machine Communication and Flagmen

In South Africa, struck-by accidents account for nearly 1 in 3 construction injuries. Poor communication and blind spots around heavy machinery are leading causes. Using spotters and clear signals saves lives.

Key Points

1. Blind Spots
   • Heavy machinery has large blind spots.
   • If you can’t see the operator, the operator can’t see you.
2. Use of Flagmen/Spotters
   • A flagman directs the movement of machinery and traffic around the site.
   • Must use standard hand signals or radios for clear communication.
   • Should always wear high-visibility clothing.
3. Communication Rules
   • Agree on signals before work starts.
   • Never assume the operator sees you — wait for acknowledgement.
   • Radios are preferred over mobile phones on site — instant, reliable, and hands-free.
4. Safety Reminders
   • Keep safe distance from operating machinery.
   • Do not walk behind moving equipment unless cleared by the flagman.
   • Operators must stop work if communication is lost.

Real Example

On many sites, workers have been struck because they entered a machine’s blind spot without signaling. With a spotter in place, these incidents are preventable.

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