High-Visibility Clothing for Trades: The UK Rules (Hi-Vis Guide)

What Hi-Vis Is and When It's Legally Required

High-visibility clothing — hi-vis — is PPE designed to make the wearer conspicuous in daylight, twilight and in vehicle headlights at night. It combines fluorescent background material (which performs in daylight) with retroreflective tape (which performs when light hits it after dark). The two materials do different jobs, which is why a proper hi-vis garment needs both.

Hi-vis is not automatically mandatory for every trade. Under the Personal Protective Equipment at Work Regulations 1992 — as amended by the 2022 Regulations that extended duties to limb (b) workers such as casual and gig workers — an employer must carry out a risk assessment and provide suitable PPE free of charge wherever a risk to health and safety cannot be controlled by other means. Where that risk assessment identifies a hazard from moving vehicles, plant, low light or poor visibility, hi-vis becomes the required control and the employer must provide it.

In practice that means hi-vis is effectively compulsory on most construction sites, near roads and highways, in warehouses and yards with moving plant, and anywhere a vehicle and a worker share space. It is the risk assessment — not a blanket rule — that drives the requirement, and it is the risk assessment that should determine which class of garment is appropriate.

The Standard: BS EN ISO 20471

The British and European standard for high-visibility clothing is BS EN ISO 20471. Any compliant garment will carry a CE or UKCA mark and a label showing the standard, the class and the maximum number of wash cycles. The standard sets minimum areas of fluorescent background material and retroreflective tape, and divides garments into three classes by the amount of visible material they provide. The higher the class, the more material and the greater the visibility.

The class is determined by the minimum visible surface area of each material on the garment, measured in square metres. A garment that does not meet the minimum areas for a class cannot be certified to that class — which is why an undersized or worn vest may technically fall short of its rated class even if the label still says otherwise.

Class 1 — Lowest Visibility

Class 1 is the lowest level and requires the smallest areas of material — in the region of 0.14m² of fluorescent background material and 0.10m² of retroreflective tape. Typical Class 1 garments include hi-vis trousers, gaiters and some lightweight harnesses. Class 1 is only suitable for low-risk environments away from significant vehicle movement — for example, off-road work, low-speed private yards or warehouse tasks where traffic is light and well controlled.

Class 2 — Intermediate Visibility

Class 2 requires more material — around 0.50m² of fluorescent background and 0.13m² of retroreflective tape. The classic Class 2 garment is a hi-vis waistcoat or vest. Class 2 suits intermediate-risk work such as general construction sites, delivery and logistics work, car parks, and roadside work where traffic speeds are lower. It is the most common class worn by tradespeople on routine site work, but it is not enough on its own for high-speed roads.

Class 3 — Highest Visibility

Class 3 is the highest level and offers the greatest conspicuity, requiring around 0.80m² of fluorescent background and 0.20m² of retroreflective tape. To achieve this area, a Class 3 garment must cover the torso and have sleeves — a hi-vis jacket or coverall — so that the wearer's shape is visible from any angle. Class 3 is required for high-speed roads, work in poor or failing light, and night work. A vest alone can never be Class 3 because it lacks the sleeve area, which is why high-speed highway work specifies jackets or full coveralls.

When Each Class Applies

Matching the class to the work is the part most trades get wrong. The general principle is that the higher the vehicle speed and the worse the visibility, the higher the class you need. A Class 2 vest that is fine for a low-speed delivery yard is not adequate alongside a 70mph dual carriageway.

For highway and road works, Chapter 8 of the Traffic Signs Manual sets the requirements for working near live traffic. It requires Class 3 high-visibility garments on or near high-speed roads — anyone working on motorways and high-speed dual carriageways must wear Class 3 jackets or coveralls, not a vest. On lower-speed and minor roads the requirement may step down to Class 2, but the safe default near any live traffic and in poor light is Class 3.

• Class 1: low-risk, off-road, low-speed private yards, light controlled traffic.
• Class 2: general construction, logistics, car parks, lower-speed roadside work in good light.
• Class 3: high-speed roads, motorways, night work and any work in poor or failing visibility.

Where in doubt, go higher. The cost difference between a Class 2 vest and a Class 3 jacket is small compared with the consequences of a worker not being seen.

Colours: Yellow, Orange-Red and Retroreflective Tape

BS EN ISO 20471 permits three fluorescent background colours: fluorescent yellow, fluorescent orange-red and fluorescent red. Fluorescent yellow is the most widely used on general construction and road works because it contrasts strongly with most backgrounds. Orange-red is often chosen to distinguish certain roles or to stand out against green and yellow vegetation.

Whatever the background colour, a compliant garment also carries silver-grey retroreflective tape. The fluorescent material does the work in daylight; the retroreflective tape returns light to its source — a vehicle's headlights — after dark, which is what makes the wearer visible at night. A garment with only fluorescent material and no retroreflective tape is not compliant and will not perform in the dark.

Care, Washing and Replacement

Hi-vis is consumable PPE — it does not last forever, and a faded or dirty garment may no longer meet its rated class. Both the fluorescent dye and the retroreflective tape degrade with washing, UV exposure, abrasion and contamination. A vest caked in mud or bleached by the sun is providing far less protection than the label suggests.

• Maximum wash cycles: the garment label states a maximum number of wash cycles — often 25 — after which the manufacturer no longer guarantees performance. Washing reduces performance over time, so track how many washes a garment has had.
• Follow the care label: wash at the stated temperature, avoid bleach and harsh detergents, and do not tumble dry above the rated heat — excessive heat damages the retroreflective tape.
• Replace when degraded: a garment that is faded, heavily soiled, torn or has damaged or peeling retroreflective tape has effectively lost its certification and must be replaced. It no longer meets the class it was sold as.

A simple rule for the toolbox talk: if you can no longer tell a worker is wearing hi-vis from a distance in normal conditions, the garment has failed and needs replacing — regardless of what the label says.

Rail Work: RIS-3279 (Not ISO 20471)

Trades working on or near the railway should not assume their standard construction hi-vis is acceptable. The railway uses its own standard — RIS-3279-TOM, the Rail Industry Standard for high-visibility clothing — rather than BS EN ISO 20471. RIS-3279 specifies orange high-visibility clothing so that workers are distinguishable in the rail environment, and garments must be certified to that standard, not the general construction one.

If your business takes on rail contracts, factor in dedicated orange RIS-3279-compliant garments and the associated certification — yellow ISO 20471 vests from general site work will not satisfy a rail induction. Confirm the exact requirement with the principal contractor before mobilising, as rail access is tightly controlled.

Who Pays: Employer Duties to Provide, Maintain and Store

The employer pays. Under the PPE at Work Regulations, an employer must provide suitable hi-vis free of charge to employees and to the limb (b) workers brought into scope by the 2022 amendment — you cannot lawfully charge a worker for the PPE their job requires, nor deduct it from wages. The duty does not stop at handing over a vest.

• Provide: supply hi-vis of the correct class for the assessed risk, free of charge, in the right size for each worker.
• Maintain: keep it in good, effective condition — inspect garments, replace faded, soiled or damaged items, and track wash cycles where relevant.
• Store: provide somewhere suitable to keep PPE so it stays clean, dry and serviceable between uses.
• Train and instruct: make sure workers know when to wear it, which class applies, and how to check it is still fit for use.

Tying Hi-Vis Into Your Induction and PPE Policy

Hi-vis requirements belong in your written PPE policy and your site induction so that every worker and subcontractor knows what is expected before they start. A clear policy removes ambiguity, demonstrates compliance and protects you if an incident occurs.

• State the minimum hi-vis class for each type of work, linked back to your risk assessment.
• Make hi-vis a condition of site entry in the induction, and check it on arrival.
• Set out who provides garments (the employer), how replacements are requested, and how condition is checked.
• Include rail or other specialist requirements (RIS-3279) where relevant, separately from general site hi-vis.
• Record that each worker was inducted and issued the correct PPE — your job and compliance records should capture this.

Quick Reference: BS EN ISO 20471 Classes

Minimum areas are indicative figures from the standard and assume the smallest garment size; always check the individual garment label for its certified class and maximum wash cycles.