Foggy Conditions Toolbox Talk

Fog can make a familiar jobsite dangerous fast. Workers may not see moving equipment, open edges, traffic, suspended loads, uneven ground, or other crews until they are too close to react.

This talk focuses on staying visible, slowing down work, improving communication, and knowing when fog makes a task unsafe to continue.

Why This Matters

• Low visibility increases the chance of struck-by incidents with trucks, forklifts, skid steers, cranes, and delivery vehicles.
• Operators may not see spotters, pedestrians, barricades, material stacks, or changes in grade.
• Fog can leave surfaces damp, making ladders, stairs, decking, rebar, forms, and equipment steps slippery.
• Hand signals may be hard to see, and radio communication may be needed for safe coordination.
• Drivers entering or leaving the site may not see workers, gates, flaggers, or traffic control until the last second.

Common Hazards

• Workers walking through equipment routes, delivery zones, or parking areas without being clearly visible.
• Operators moving equipment when they cannot see the full path of travel.
• Backing trucks, telehandlers, forklifts, or skid steers without a clear spotter or working backup alarm.
• Crane picks, hoisting, or material movement where the operator, signal person, or landing area cannot be seen clearly.
• Wet walking surfaces, muddy access roads, hidden holes, loose material, or uneven ground covered by fog.
• Early morning fog near roads, bridges, water, or low areas reducing visibility more in some parts of the site than others.

Safety Checklist

Before Work Begins

• Check visibility across the site before starting equipment, deliveries, hoisting, or work near traffic.
• Review traffic routes, pedestrian paths, delivery areas, and no-go zones with the crew.
• Make sure high-visibility clothing is clean, worn correctly, and not covered by jackets, tool belts, or materials.
• Confirm radios, horns, backup alarms, lights, and strobes are working where needed.
• Set up extra cones, barricades, signs, lighting, or flaggers if normal controls are hard to see.
• Decide which tasks will be delayed if the operator, spotter, load, landing zone, or work face cannot be seen.

During Work

• Slow down walking, driving, backing, and equipment movement when visibility is reduced.
• Use spotters for backing, tight access, blind corners, delivery areas, and equipment crossings.
• Keep eye contact or radio contact between operators, spotters, signal persons, and workers on foot.
• Do not walk behind equipment, between vehicles, or into travel lanes unless the operator knows you are there.
• Use headlights, work lights, beacons, and flashers where they help others see equipment and vehicles.
• Keep clear of suspended loads, swing areas, and moving materials when the full operation cannot be seen.

Crew Talking Points

• Where is visibility the worst on this site today?
• Which equipment routes or delivery areas need a spotter or extra control?
• Are our high-visibility vests, lights, radios, and alarms ready to use?
• What tasks should be delayed until fog clears?
• How will we communicate if hand signals cannot be seen clearly?
• Speak up if you cannot see a worker, operator, load, edge, or travel path clearly enough to work safely.

Stop Work If

• Equipment operators cannot see the full path of travel or a clear spotter.
• Workers on foot cannot be seen by drivers, operators, or signal persons.
• Hoisting, lifting, or landing materials cannot be controlled with clear communication.
• Traffic control, barricades, open edges, holes, or work zones are not visible from a safe distance.
• Wet surfaces, mud, or hidden ground conditions create slip, trip, or fall hazards that cannot be corrected.
• Visibility changes suddenly and the crew no longer has a clear plan for safe movement.

Final Reminder

Fog reduces reaction time for everyone. Slow down, stay visible, communicate clearly, and stop the task when you cannot see enough to do it safely.