Colour Contrast Minimum Ratio for Compliance Marking
Regulation AODA + OHSA + Transport Canada · Canada
§The Law
AODA + OHSA + Transport Canada — Regulation AODA + OHSA + Transport Canada
“Compliance markings must achieve sufficient luminance contrast between the characters and background to be legible under the required viewing conditions.”
View official regulation text✓Plain English
70% luminance contrast is the AODA standard; Transport Canada and MTO require contrast sufficient for roadside readability. White on black achieves 100%.
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Specific Requirements
70% minimum luminance contrast (AODA)
High contrast for vehicle markings
Calculate using WCAG 2.1 contrast ratio formula
White or yellow on dark, dark on light
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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.
All sources are official government publications or recognized industry authorities. Links verified March 2026. If you find a broken link, let us know.
See Also — Related Regulations
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Source library
Confirm the current rule before relying on a marking
Our guides are a starting point for locating government sources connected to AODA + OHSA + Transport Canada markings. Requirements can depend on jurisdiction, vehicle or site details, and the date you act.
- Open the linked official source and check its current version.
- Confirm the rule applies to your exact vehicle, vessel, property, or operation.
- Verify wording, dimensions, placement, and effective dates before ordering.
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