UK health and safety signs use colour and shape to carry their meaning. Red circles with a diagonal bar prohibit an action. Yellow triangles warn of a hazard. Blue circles tell you what you must do. Green rectangles show escape routes and first aid. Red squares mark fire-fighting equipment. The rules come from the Health and Safety (Safety Signs and Signals) Regulations 1996.
This guide is for employers, managers and anyone responsible for a workplace. It explains what health and safety signs mean by colour and shape, when the law says you need a sign, and the parts of the regulations most people miss, such as hazard striping, alarms and the duty to train staff in what the signs mean.
What are health and safety signs?
A health and safety sign gives a message about safety or health at work through a combination of shape, colour and a pictogram. Because the meaning sits in the shape and colour, people can understand it at a glance, even if they cannot read the wording or do not speak English.
In Great Britain the legal framework is the Health and Safety (Safety Signs and Signals) Regulations 1996 (SI 1996/341). HSE explains how to comply in its guidance L64, Safety signs and signals, now in its third edition (2015). The regulations cover more than signboards. They also include illuminated signs, acoustic signals such as fire alarms, verbal communication and hand signals.
Safety sign colours and what they mean
There are four safety colours, and each has a fixed meaning set out in Schedule 1 to the regulations.
| Colour | Meaning | Used for |
|---|---|---|
| Red | Prohibition, danger alarm, fire-fighting equipment | Dangerous behaviour; stop, shutdown and emergency cut-out devices; evacuation; identifying and locating fire equipment |
| Yellow or amber | Warning | Be careful, take precautions, examine |
| Blue | Mandatory | Specific behaviour or action, such as wearing personal protective equipment |
| Green | Emergency escape, first aid, no danger | Doors, exits, escape routes, first-aid equipment and facilities; return to normal |
Source: Health and Safety (Safety Signs and Signals) Regulations 1996, Schedule 1, Part I, as set out in HSE L64.
The five types of safety sign
Most people talk about five types of sign: prohibition, warning, mandatory, safe condition and fire equipment. Each has a set shape and colour scheme, and the regulations specify a minimum share of the sign that must be the safety colour.
| Sign type | Shape | Colours | Message | Example |
|---|---|---|---|---|
| Prohibition | Circle with diagonal bar | Black pictogram on white, red edge and bar (red at least 35% of the sign) | You must not | No smoking, no pedestrian access |
| Warning | Triangle | Black pictogram on yellow, black edge (yellow at least 50%) | Danger, take care | Electrical hazard, forklift trucks operating |
| Mandatory | Circle | White pictogram on blue (blue at least 50%) | You must | Wear hearing protection, wear safety boots |
| Safe condition (emergency escape or first aid) | Rectangle or square | White pictogram on green (green at least 50%) | This way to safety | Fire exit, first aid kit, emergency eyewash |
| Fire-fighting equipment | Rectangle or square | White pictogram on red (red at least 50%) | Fire equipment is here | Fire extinguisher, fire alarm call point, fire hose reel |
Source: HSE L64, Schedule 1, Part II (intrinsic features of signboards).
Prohibition signs
A prohibition sign forbids behaviour that is likely to increase or cause danger. Use them where an action would create a hazard, such as entering a restricted area or switching on equipment under maintenance.
Warning signs
A warning sign alerts people to a hazard nearby. The pictogram tells them what the hazard is: a lightning flash for electricity, a falling figure for a drop, a flame for flammable material. HSE says a yellow warning triangle should also be used at the entrance to stores holding significant quantities of hazardous substances, unless the labels on individual containers are clearly visible from outside.
Mandatory signs
A mandatory sign tells people they must do something. The most common use is for PPE, such as eye protection or hearing protection zones. A mandatory sign does not replace the duty to assess and control the hazard first. Our guide to the PPE Regulations explains where PPE fits.
Safe condition signs
L64 calls these emergency escape or first-aid signs. They show escape routes, emergency exits, first-aid kits, eyewash stations and assembly points. Fire exit signs are the ones you will see most often.
Fire-fighting equipment signs
Red squares or rectangles with a white pictogram show where fire extinguishers, hose reels and alarm call points are. They tell people where equipment is. They do not tell people how to use it, which is why staff need fire awareness training as well.
When does the law require a safety sign?
You must provide a safety sign when your risk assessment shows a risk cannot be avoided or adequately reduced by other means. Regulation 4 places the duty on employers, and HSE’s guidance is clear that safety signs are not a substitute for other means of controlling risks.
In practice that means working through the hierarchy of control first. Remove the hazard if you can, then engineer it out or guard it, then organise the work safely. A sign comes in for whatever significant risk is left. If no significant risk remains, you do not need a sign, and L64 warns that putting up too many signs causes confusion and makes the important ones easier to ignore.
The trigger is your risk assessment. If you cannot point to the risk a sign is managing, ask whether it needs to be there.
Employer duties beyond putting up signs
The regulations ask for more than signboards on walls. Employers must also:
- Maintain the signs. Regulation 4 requires employers to provide and maintain them. A faded, dirty or obscured sign no longer does its job.
- Explain them. Regulation 5 requires suitable and sufficient instruction and training in the meaning of safety signs and the action to take. New starters, agency workers and contractors all need this.
- Mark obstacles and dangerous locations. Where people could walk into something, fall, or be hit by falling objects, use alternating yellow and black or red and white stripes at about 45 degrees.
- Mark traffic routes. Vehicle routes inside buildings should be marked with continuous lines, preferably white or yellow, where the layout calls for it.
- Label hazardous substances. Containers and visible pipework carrying hazardous chemicals should generally show the relevant CLP hazard pictograms, placed where people are most likely to be exposed, such as filling points and drain valves. The COSHH Regulations cover how you control those substances.
- Get signals right. Acoustic alarms should be clearly audible above background noise without being painful, and the evacuation signal must be continuous. Anyone giving hand signals, such as a banksman, should be competent and trained in the correct signals.
Fire safety signs: a separate legal route
Fire exit and fire equipment signs follow the same colours and shapes, but the main legal duty to provide them sits elsewhere. In England and Wales it comes from the Regulatory Reform (Fire Safety) Order 2005. In Scotland it comes from the Fire (Scotland) Act 2005. Building Regulations add further requirements for some fire signs.
Two points catch people out. A fire exit sign with text only, such as the words “Fire Exit” on their own, is not acceptable; it needs a pictogram. And the positioning of fire signs should come out of your fire risk assessment, not guesswork.
Do old-style signs still comply?
Usually, yes. L64 says pictograms from BS EN ISO 7010 can be used to meet the regulations, and that standard offers more variations, particularly for fire exit signs. Fire safety signs based on the older BS 5499 symbols remain acceptable as long as they still do their job. The exception is the old “harmful or irritant material” warning sign, which L64 says has been deleted and should no longer be used.
The bigger risk is mixing styles in the same building. If one exit sign shows a running figure and the next shows only an arrow, people hesitate. When you replace signs, replace a whole route or area at once.
Can you add text to a safety sign?
Yes. Supplementary text can sit alongside the pictogram to explain an unfamiliar sign or give detail, for example “Hard hats must be worn beyond this point”. HSE guidance says the text panel should use the same background colour as the sign it supports and the wording should match the sign type, so a mandatory sign uses “must” rather than “should” or “may”. Text should support the pictogram, never replace it.
Frequently asked questions
What are the 5 types of health and safety signs?
Prohibition signs (red circle with a diagonal bar), warning signs (yellow triangle), mandatory signs (blue circle), safe condition signs for emergency escape and first aid (green rectangle or square) and fire-fighting equipment signs (red rectangle or square).
What do the colours of safety signs mean?
Red means prohibition, danger or fire-fighting equipment. Yellow or amber means warning. Blue means a mandatory action. Green means emergency escape, first aid or a safe condition. The meanings are fixed by Schedule 1 to the Health and Safety (Safety Signs and Signals) Regulations 1996.
Are safety signs a legal requirement?
Yes, where your risk assessment shows a significant risk remains that you cannot avoid or adequately reduce by other means. Signs supplement other controls; they do not replace them. If no significant risk remains, a sign is not required.
What does a blue safety sign mean?
A blue circle with a white pictogram is a mandatory sign. It tells people they must do something, most often wear a specific item of personal protective equipment such as eye or hearing protection.
Do employers have to train staff on safety signs?
Yes. Regulation 5 requires employers to give suitable and sufficient instruction and training in the meaning of safety signs and the action to take in connection with them.
What is the difference between a warning sign and a prohibition sign?
A warning sign is a yellow triangle that alerts people to a hazard. A prohibition sign is a red circle with a diagonal bar that forbids a specific action. One says take care, the other says do not.
Is a text-only fire exit sign acceptable?
No. HSE guidance says a fire safety sign containing only text is not acceptable. The sign needs a pictogram, which can be supported by text.
Where to learn more
- Health and Safety Awareness Training: one-day in-house course that includes safety signs and signals
- Comprehensive Health and Safety Awareness Training: a broader course for teams who need more depth
- Fire Awareness Training: what fire signs and equipment mean in practice
- The hierarchy of control explained: why signs come last
- Risk assessments: a UK guide
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