Paragraph 1
The areas marked A, B and C in the diagram indicate areas of the surface on the face of the triangle as follows:
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A — Red reflectorised surface. Not more than a total of 15 square centimetres may be obscured by constructional components.
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B — Red fluorescent surface.
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C — May have either red reflectorised surface or a combination of both red reflectorised and red fluorescent surface. Not more than 10 square centimetres in each corner may be obscured by constructional components.