Colour Contrast Minimum Ratio for Compliance Marking
Regulation AODA + OHSA + Transport Canada · Canada
§Source summary
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.
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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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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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See Also — Related Regulations
customer-provided accessibility specification s.16(3)
Colour Contrast for Signs — AODA IASR customer-provided accessibility specification
ASTM D4956
ASTM D4956 Retroreflective Sheeting Standard
HTA s.16(3)(a) / s.103(1) + SOR/2010-91 + 49 CFR 390.21 + CARs 900.14
Compliance Lettering Minimum Size Reference — Canada
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- AODA + OHSA + Transport Canada
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- 🇨🇦 Canada
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