Paragraph 7 I1

The triangle must be legibly and permanently marked with the marking designated as an approval mark by regulation 4 of the Motor Vehicles (Designation of Approval Marks) Regulations 1979^f1 and shown in item 27 of Schedule 2 to those Regulations.

The surface coloured red and marked A must be reflectorised;

Not more than 15 square centimetre of the surface marked A may be obscured by constructional components;

The surface coloured red and marked B must be fluorescent;

The surface marked C must be either—

Not more than 10 square centimetre of the surface marked A may be obscured by constructional components;

In the case of the triangle provided for at item 33—

Corners of a triangle must be radiused.

All sides of a triangle must be of the same length.

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 must not be illuminated through external illumination.