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Traffic Signs (Temporary Obstructions) Regulations (Northern Ireland) 1999

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The Traffic Triangle — First Diagram

1.  The areas marked A, B and C in the diagram indicate areas of the surface on the face of the triangle as follows:

  • A — Red reflectorised surface. Not more than a total of 15 square centimetres may be obscured by constructional components.

  • B — Red fluorescent surface.

  • 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.

2.  The corners shall be radiused.

3.  All sides shall be the same length.

4.  The reflectorised areas of the surface may be internally illuminated provided that such illumination is steady, presents a uniform appearance throughout that area and does not impair the retroreflecting properties of that area of the surface. The triangle shall not be directly illuminated externally.

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