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What are the retroreflection standards for road traffic signs, high visibility clothing, reflective tapes and sheets?

The standards for road traffic signs, high visibility clothing, reflective tapes and sheets in the following table.

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Object Standards Illumination angle (Beta1, Beta2) Observation angle (α)
Road traffic signs EN 12899-1 Beta1 (=5° or 30°or 40°) and Beta2 =0° α = 0.2° or 0.33° or 2°
Road traffic signs

ASTM E1709

ASTM E2540

 Beta1 (=-4° or 30°or 40°) and Beta2 =0° α = 0.2° or 0.5°

High visibility clothing

 EN ISO 20471 Beta1 (=5° or 20° or 30° or 40°) and Beta2 =0°. α = 0.2° or 0.33°or 1° or 1.5°
Reflective sheets DIN 67520 Beta1 (=5° or 20° or 30° or 40°) and Beta2 =0° α = 0.2° or 0.33°or 1° or 1.5° or 2°
Reflective tapes ECE 104 Beta1 = 0° and Beta2 (=5° or 30° or 40° or 60°) α = 0.33°
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