Hazard Signs

UK hazard and warning signs: a complete buyer's guide

Hazard signs are the yellow triangles every UK workplace knows. Under BS EN ISO 7010 — the unified UK and European safety sign standard — they share a single instantly-recognisable format: a black equilateral triangle frame around a yellow background, with a black pictogram showing the specific hazard. The format is deliberately consistent so workers and visitors recognise "warning" at a glance, before they read any text.

When are hazard signs legally required?

The Health and Safety (Safety Signs and Signals) Regulations 1996 require employers to use a compliant safety sign where a risk to health or safety cannot be eliminated or sufficiently reduced by other means. In practice that triggers hazard signage anywhere a residual risk exists after other controls are in place — which covers most workplaces.

Sector-specific regulations layer on top:

• COSHH 2002 — Control of Substances Hazardous to Health. Requires labelling and signage for areas where hazardous substances are stored, used, or generated.
• Electricity at Work Regulations 1989 (EAWR) — requires warning signs on equipment with live conductors.
• Control of Asbestos Regulations 2012 — specific asbestos warning signage at work areas containing asbestos.
• CDM 2015 (Construction Design and Management) — sites must display the relevant hazard signs for the specific risks present.
• Ionising Radiations Regulations 2017 — radiation warning signage at controlled-area boundaries.

The standard hazard pictograms

BS EN ISO 7010 defines around 30 standard hazard pictograms. Most UK workplaces use a small subset:

• Physical: slippery surface, falling objects, low headroom, hot surface, sharp edges, trip hazard, deep water
• Electrical: general electrical hazard, high voltage, lightning
• Chemical: corrosive, toxic, oxidising, harmful, environmental hazard, irritant
• Biological: biohazard, infectious material
• Radiation: ionising, non-ionising, laser
• Fire: flammable material, combustible dust
• Traffic and machinery: forklift truck operating, vehicle movement, automatic start

Multi-message and site safety boards

Construction sites, depots, and warehouses with multiple risks often use multi-message hazard signs that combine several warnings on one board — e.g. a site safety sign showing "hard hat must be worn", "hi-vis must be worn", "danger: heavy plant", and "no unauthorised access" in a single panel. These reduce visual clutter at site entrances and ensure all required safety messages are visible at a glance. Direct Signs manufactures bespoke multi-message boards in any combination.

Materials by environment

Match the material to the environment:

• Self-adhesive vinyl — smooth indoor surfaces; lowest cost
• Rigid PVC (Foamex) — general-purpose, indoor and sheltered outdoor
• Aluminium composite — long-life exterior signage; weather-resistant
• Aluminium — high-impact, industrial environments, vehicles, plant equipment