Document ID: chunk:federal_register_of_legislation:F2023C00158:front:0:p11
Version: federal_register_of_legislation:F2023C00158
Segment Type: other
Provision Reference: 
Character Range: 28451–31351

(annex 8, paragraph 2), and then to the abrasive-strength test of the rear face of the retro-reflecting device (annex 8, paragraph 5).

       Third Group:

       The two samples shall be subjected to the test for stability in time of the optical properties of retro-reflecting device (annex 9).

       Fourth Group:

       The two samples shall be subjected to the colour-fastness test (annex 11).

       3. After undergoing the tests referred to in the above paragraph, the retro-reflecting devices in each group must have:

       3.1. a colour which satisfies the conditions laid down in annex 6.  This shall be verified by a qualitative method and, in case of doubt, confirmed by a quantitative method.

       3.2. a CIL which satisfies the conditions laid down in annex 7.  The verification shall be performed only for an angle of divergence of 20 and an illumination angle of V = H = 0 degrees or, if necessary, in the position specified in annex 7, paragraphs 4 and 4.1.

       Annex 5

       SPECIFICATIONS OF SHAPE AND DIMENSIONS

       1. SHAPE AND DIMENSIONS OF RETRO-REFLECTING DEVICES IN CLASS IA OR IB

       1.1. The shape of the illuminating surfaces must be simple, and not easily confused at normal observation distances, with a letter, a digit or a triangle.

       1.2. The preceding paragraph notwithstanding, a shape resembling the letters or digits of simple form O, I, U or 8 is permissible.

       2. SHAPE AND DIMENSIONS OF RETRO-REFLECTING DEVISES IN CLASS III A

       (See appendix to this annex)

       2.1. The illuminating surfaces of retro-reflecting devices in Class III A must have the shape of an equilateral triangle.  If the word "TOP" is inscribed in one corner, the apex of that corner must be directed upwards.

       2.2. The illuminating surface may or may not have at its centre a triangular, non-retro- reflecting area, with sides parallel to those of the outer triangle.

       2.3. The illuminating surface may or may not be continuous.  In any case, the shortest distance between two adjacent retro-reflecting optical units must not exceed 15mm.

       2.4. The illuminating surface of a retro-reflecting device shall be considered to be continuous if the edges of the illuminating surfaces of adjacent separate optical units are parallel and if the said optical units are evenly distributed over the whole solid surface of the triangle.

       2.5. If the illuminated surface is not continuous, the number of separate retro-reflecting optical units including the corner units shall not be less than four on each side of the triangle.

       2.5.1. The separate retro-reflecting optical units shall not be replaceable unless they consist of approved retro-reflecting devices in Class I A.

       2.6. The outside edges of the illuminating surfaces of triangular retro-reflecting devices in Class III A shall be between 150 and 200mm