ASTM D4956 Retroreflective Sheeting Standard
Regulation ASTM D4956 · Canada
§The Law
ASTM D4956 — Regulation ASTM D4956
“ASTM D4956 classifies retroreflective sheeting into types (I through XI) based on reflectivity performance, with Type I being standard engineer grade and higher types for premium applications.”
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ASTM D4956 is the benchmark standard for retroreflective sheeting. Type I is standard engineer grade; higher types have better reflectivity for highway signs and high-visibility applications.
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Specific Requirements
Type I — Engineer Grade (most common for vehicles)
Type III/IV — High Intensity Prismatic
Type XI — Diamond Grade prismatic
Transport Canada references ASTM D4956 for compliance
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