Colour Contrast for Signs — AODA IASR O.Reg 191/11
Regulation O.Reg 191/11 s.16(3) · Province of Ontario
§The Law
O.Reg 191/11 s.16(3) — Regulation O.Reg 191/11 s.16(3)
“Signs must have a minimum 70% luminance contrast between characters and their background to ensure readability for people with low vision.”
View official regulation text✓Plain English
70% luminance contrast means your letters must be significantly lighter or darker than the background. Black on white achieves 100%. Dark navy on medium grey fails.
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Specific Requirements
70% minimum luminance contrast
Applies to all text on AODA signs
Calculated using luminance formula
High contrast aids low vision users
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📚Sources & Authority
Every claim on this page is backed by official government legislation and verified industry sources. Last verified: March 2026.
🏛 Official Government Sources
AODA — Integrated Accessibility Standards Regulation
Ontario.ca · March 2026
O. Reg. 191/11 defines accessibility standards for Ontario organizations including signage contrast, tactile requirements, Braille, and wayfinding specifications.
Accessibility for Ontarians with Disabilities Act, 2005
Ontario.ca · March 2026
The AODA is Ontario's accessibility law. Full compliance was required by January 1, 2025. Penalties up to $100,000/day for individuals, $200,000/day for corporations.
🏢 Industry Organizations
All sources are official government publications or recognized industry authorities. Links verified March 2026. If you find a broken link, let us know.
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Shop AODA SignsOr call (289) 228-7021Regulation Quick Facts
- Regulation
- O.Reg 191/11 s.16(3)
- Jurisdiction
- 🏛 Province of Ontario
- Category
- AODA Accessibility
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