Workplace Safety Signage: What the Rules Ask For

Signs come last, not first

The principle behind the rules is that signage does not remove a hazard. You are expected to eliminate or control the risk first — guard the machine, isolate the substance, fix the floor — and use a sign where a significant risk remains, or where a sign is needed to direct people in an emergency.

That is why a workplace covered in warning signs is often a warning in itself: signage is being used where a control was needed.

The standard categories, by shape and colour

• Prohibition: round, red border with a diagonal bar on white. Something must not be done, for example no smoking or no unauthorised access.

• Warning: yellow triangle with a black border and symbol. A hazard exists, for example a slippery surface, a drop or a live conductor.

• Mandatory: blue circle with a white symbol. Something must be done, typically wearing specific protective equipment.

• Safe condition: green rectangle or square with a white symbol. Escape routes, exits, first aid and assembly points.

• Fire fighting equipment: red rectangle or square with a white symbol. Extinguishers, alarm call points, hose reels.

Learning these five categories makes it far easier to audit a site, because you can see at a glance whether a message has been given the right visual treatment.

Symbols first, words second

Safety signs are built around pictograms so they work regardless of the reader's language or literacy. Standardised symbols are the reason a green running figure means escape route across Europe.

Text is a supplement. Supplementary wording on or beneath the sign is helpful for clarity — "Fire door keep shut", "Eye protection must be worn" — but a sign should not rely on words alone where a recognised symbol exists.

Where signs are typically needed

Escape routes and final exits, from every point where someone might need to choose a direction. Fire alarm call points and fire fighting equipment. Areas requiring protective equipment, signed at the entrance to the area rather than only inside it. Specific hazards that remain after control: low headroom, changes in level, forklift routes, hot surfaces, high voltage.

Also traffic and pedestrian separation in yards and loading areas, and identification of things people need in an emergency: first aid points, assembly points, isolation points and spill equipment.

Escape route signage in practice

Escape signage should let someone leave without local knowledge. From any position on an escape route, the next sign should be visible, so a person moves from one to the next without hesitating at a junction. Directional arrows must point along the actual route, and final exits need to be identifiable as final exits.

Where lighting may fail, escape signage needs to remain visible — photoluminescent material or illuminated and internally lit signs are the usual answers, and the choice should follow your fire risk assessment rather than a catalogue.

Visibility, siting and materials

A compliant sign in the wrong place fails. Signs need to be at a height where they are seen and not obscured by stock, plant, opened doors or parked vehicles, lit well enough to read, and sized for the viewing distance — a sign read across a warehouse must be much larger than one on a door.

Material follows environment: rigid PVC or foamex for dry interiors, aluminium or robust engineered plastics for exterior and industrial use, photoluminescent for escape routes, and chemically resistant materials in wash-down or process areas. Fixings matter too, because a sign that falls off in a wet area is worse than no sign at all.

Keeping the scheme current

Safety signage needs maintaining like any other control. Signs fade, symbols become obsolete when standards are updated, layouts change when a wall goes in, and the commonest fault of all is a printed A4 notice taped over the real sign.

A simple periodic walk-round works well: is every sign legible, clean, correctly positioned, unobstructed, and still true? Record what you check, because that record is what demonstrates the scheme is managed rather than merely installed.

Common shortfalls we see

• Escape routes signed in one direction only, so the route breaks down at a junction

• Mandatory protective equipment signs inside an area instead of at its entrance

• Signs obscured by racking, stacked stock or a propped-open door

• Faded yellow warning signs where the symbol is no longer distinguishable

• Improvised paper notices doing the job of a permanent sign

• Signage that contradicts the fire risk assessment after a layout change

Common questions