OSHA 10-Hour Construction ReviewFocus Four HazardsHard
A construction worker is operating a compact excavator in a congested urban environment. Due to space constraints, pedestrians and other workers are sometimes in close proximity to the excavator's operating area. Which control measure is most effective in preventing 'struck-by' incidents caused by the excavator's rotating superstructure?
- AEstablishing a clearly marked exclusion zone around the excavator's swing radius.
- BRelying solely on the operator's vigilance and mirrors.
- CEquipping the excavator with bright flashing lights.
- DImplementing a site-wide 'no-phone' policy for all personnel.
Show answer & explanationAnswer & explanation
Correct answer: A. Establishing a clearly marked exclusion zone around the excavator's swing radius.
Establishing a clearly marked exclusion zone (barricaded or coned off) around the excavator's full swing radius is the most effective proactive measure. It physically separates workers and pedestrians from the danger zone, minimizing the risk of 'struck-by' incidents, especially in congested areas where vigilance alone may not be sufficient.
Why the other options are wrong
- B. Operator vigilance is crucial, but mirrors have blind spots, and human error is always a factor; it's not the 'most effective' control.
- C. Flashing lights increase visibility but do not physically prevent entry into the danger zone.
- D. A 'no-phone' policy improves general awareness but does not directly address the physical separation from the swing radius.
Excavator Swing Radius Exclusion Zone
A designated area around heavy equipment, particularly excavators, that must be kept clear of all personnel and obstructions to prevent 'struck-by' incidents from the rotating superstructure.
- Should encompass the full reach of the machine's rotation.
- Must be clearly marked with barriers, cones, or warning tape.
- Requires strict enforcement and communication to all site personnel.
Memory trick: Zone it out, keep them out!