Convex Mirrors & Visibility Aids in Canada
Convex Mirrors & Visibility Aids — Placement, Sizing & Materials (Canada)
1) Where are convex mirrors used & what problems do they solve?
They increase sight distance at blind corners, aisle intersections, garage ramps, and loading docks. In hospitals/schools, they help prevent pedestrian collisions; in warehouses, they reduce forklift impacts at cross aisles.
2) How do I choose the correct diameter?
Use distance-to-viewer as a quick selector. A simple rule of thumb:
| Viewer Distance (approx.) | Suggested Mirror Ø | Typical Use |
|---|---|---|
| 3–5 m | 45–60 cm (18–24″) | Indoor aisles, small rooms |
| 6–9 m | 60–80 cm (24–32″) | Warehouse cross aisles, garage corners |
| 10–15 m | 80–100 cm (32–40″) | Wide intersections, dock approaches |
When in doubt, size up. Larger diameter = wider field of view and easier recognition at speed.
3) Quarter-dome, half-dome, full dome, round — which type?
Round Convex — wall/ceiling mount at corners and T-intersections.
Quarter-Dome — fits into a 90° inside corner for two directions of view.
Half-Dome — ceiling/wall junction; view across 3 directions.
Full Dome (360°) — centre of ceiling for 4-way intersections.
Driveway/Outdoor mirrors — round with hoods & weatherproof backings.
4) Acrylic vs Polycarbonate vs Glass vs Stainless — materials guide.
| Material | Pros | Watch-outs | Best For |
|---|---|---|---|
| Acrylic | Clear image, economical, light weight | More brittle in cold impact | Indoor facilities, retail, offices |
| Polycarbonate | High impact resistance, good for cold | Can scratch; add anti-scratch coating | Warehouses, parking garages, outdoor |
| Glass | Sharpest image, scratch-resistant | Heavy; breakage risk if struck | Indoor monitored areas |
| Stainless Steel | Vandal/heat resistant, durable | Heavier, costlier; slight image distortion | Harsh outdoor, food/clean rooms |
5) Mounting height, angle, and distance basics.
- Mount height: For pedestrian/forklift aisles, centre of mirror typically 2.1–2.4 m above floor; for vehicles at ramps/exits, adjust to driver eye height.
- Angle: Tilt so the far approach appears in the upper third of the mirror when viewed from the decision point.
- Distance: If people must slow to “hunt” the image, the mirror is either too small or too far.
6) Indoor vs outdoor use — wind, UV, and vandal resistance.
- Use polycarbonate or stainless outdoors; select brackets rated for wind loading.
- Add sun hoods and UV-stable backings to cut glare and warping.
- Near roads/alleys, consider anti-vandal hardware and tamper-proof fixings.
7) Parking garages & driveways — best practice (EN/FR).
- At tight ramps and columns, combine mirrors with corner guards and reflective signs.
- Keep sightlines clear of banners, pipes, or conduit.
- FR/EN: Monter à une hauteur visible par les conducteurs / Mount at driver-visible height.
8) Maintenance: cleaning, fogging, and replacement signs.
- Clean with mild soap + microfiber; avoid solvents that craze plastic.
- In cold garages, choose anti-fog coated faces or add small heaters in extreme cases.
- Replace when the surface is hazed/scratched enough to hide moving objects.
9) Common mistakes that kill visibility.
- Mirror too small for the viewing distance.
- Mounted too high/low so users see the floor/ceiling instead of the approach.
- Glare from skylights or headlights — fix with hood or angle change.
- Using brittle acrylic in unheated, high-impact garages (it cracks in winter).
10) What to bundle with mirrors for safer layouts?
- Corner & wall guards at pillars
- Wheel stoppers at bay ends
- Traffic cones for temporary works
- Reflective signage for right-of-way
- Cable protectors near chargers/doors
- Safety bollards in impact zones
Important Legal/Compliance Note (Canada)
This page is general guidance, not legal advice. Placement of mirrors in workplaces and public facilities may be subject to Occupational Health & Safety requirements, building/fire codes, and municipal standards. Mirrors used on or near public roads/driveways may require approval from the authority having jurisdiction (AHJ). Where a code, by-law, or standard specifies positioning or device types, that document prevails. Consult your AHJ or a qualified safety professional.
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