Convex Mirror Installation Guide: Heights, Angles and UK Regulations
convex mirrors are one of the most cost-effective safety tools available for eliminating blind spots in warehouses, car parks, tight junctions and road bends. But the effectiveness of a convex mirror depends entirely on correct positioning. Get the height, angle or size wrong and the mirror provides false reassurance.
Choosing the Right Mirror Size
Mirror diameter directly affects viewing distance and coverage angle. Use this as a starting guide:
| Mirror Diameter | Effective Viewing Distance | Typical Application |
|---|---|---|
| 300mm | Up to 5m | Tight shop corners, small warehouses |
| 450mm | Up to 8m | Warehouse aisles, car park corners |
| 600mm | Up to 12m | Loading bays, main warehouse crossings |
| 800mm | Up to 18m | Road junctions, industrial estate exits |
| 1000mm+ | Up to 25m | Major road bends, large distribution centres |
Installation Height
For warehouse and indoor applications:
- Mount at 2.0–2.4m high — this puts the mirror centre at approximately eye height for forklift operators
- Angle downward approximately 15–25° to show the floor area and approaching traffic
- Position so the operator can see themselves in the mirror — this confirms the viewing angle is correct
For road and outdoor applications:
- Mount at 2.4–4m high depending on road type
- On private roads and car park exits, 2.4m is typical for driver eye line
- On public roads, the highway authority will specify exact positioning
Correct Viewing Angle
A common installation mistake is angling the mirror too steeply so it shows the sky or ceiling rather than the hazard area. As a rule of thumb:
- Stand at the position where the driver/operator will be
- Look at the mirror — you should see the hazard area clearly
- You should also see a small reflection of yourself or your vehicle
- Adjust tilt until both are visible
Outdoor vs. Indoor Mirrors
Outdoor mirrors must be weatherproof. Look for:
- UV-resistant acrylic or stainless steel mirror face
- Galvanised or powder-coated steel back plate
- Anti-vandal fixing options for public areas
Indoor mirrors can be lighter and cheaper. Polished acrylic is suitable — more shatter-resistant than glass and lighter than stainless steel.
Dome Mirrors vs. Flat Convex Mirrors
Dome mirrors (hemisphere or full dome) provide a 360° or 180° view — ideal for overhead mounting at corridor intersections where vehicles approach from multiple directions. Used extensively in supermarkets, warehouses and car parks.
Wall-mounted convex mirrors are directional — they cover a defined arc. Better for corner-specific blind spots.
UK Regulations
Convex mirrors on public roads must comply with TSRGD (Traffic Signs Regulations and General Directions). Most road safety mirrors on public highways are installed by or approved by the local highway authority. On private land, there are no specific regulations but HSE guidance recommends convex mirrors as part of a workplace traffic management plan under the Workplace (Health, Safety and Welfare) Regulations 1992.
FAQ
Do I need planning permission for a road mirror?
On public highways, you need the highway authority's approval, not planning permission. On private land, planning permission is generally not required for mirrors under 1m diameter below 2m height.
How do I clean a convex mirror?
Use a soft cloth with warm soapy water. Avoid abrasive cleaners on acrylic mirrors — they scratch easily. Stainless steel mirrors can tolerate mild multipurpose cleaner.
Can convex mirrors replace a banksman?
No. Mirrors are a supplementary safety measure. HSE guidance for reversing vehicles recommends a banksman as the primary control measure, with mirrors as additional support.
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