GB/T 31887.2-2019Cycles—Lighting and retro-reflective devices—Part 2: Retro-Reflective devices (English PDF)

Foreword

This document was drafted in accordance with the rules given in GB/T 1.1-2020

"Directives for standardization - Part 1.Rules for the structure and drafting of

standardizing documents".

This document is Part 2 of GB/T 31887 "Cycles -- Lighting and retro-reflective devices".

The following parts of GB/T 31887 have already been issued.

- Part 1.Lighting and light signaling devices;

- Part 2.Retro-reflective devices;

- Part 3.Installation and use of lighting and retro-reflective devices;

- Part 4.Lighting systems powered by the cycle's movement;

- Part 5.Lighting systems not powered by the cycle's movement.

This document replaces GB/T 31887.2-2019 "Cycles -- Lighting and retro-reflective

devices -- Part 2.Retro-reflective devices". Compared with GB/T 31887.2-2019, apart

from structural adjustments and editorial changes, the main technical changes are as

follows.

a) The content applicable to lighting devices for electric cycles under GB17761 has

been deleted from the scope (see Chapter 1 of this Edition; Chapter 1 of Edition

2019);

b) The term and definition "pedal reflector" have been added (see 3.5 of this Edition);

c) The meanings and units for symbols "A", "phiR", "phiS", "E" and "CIL" have been

deleted (see Table 1 of this Edition; Table 1 of Edition 2019);

d) The test sequence for reflective tyres has been added (see Table 3 of this Edition);

e) The moisture resistance test for reflectors has been modified (see 7.1.2.4 of this

Edition; 7.1.2.4 of Edition 2019);

f) The orientation of the reflector has been changed (see 8.2.4 of this Edition; 8.2.4

of Edition 2019).

This document is modified by adopting ISO 6742-2.2023 "Cycles -- Lighting and retro-

reflective devices -- Part 2.Retro-reflective devices".

This document has undergone the following structural adjustments compared to ISO

6742-2.2023.

- Chapter 5 corresponds to Chapter 5 of ISO 6742-2.2023, where 5.1 and 5.2

Cycles -- Lighting and retro-reflective devices -- Part 2.

Retro-reflective devices

1 Scope

This document specifies the optical, chromatic, physical, and marking requirements for

cycle retro-reflective devices. The corresponding test methods are described.

This document applies to cycles used on public roads, particularly retro-reflective

devices for two-wheeled cycles conforming to GB 3565.2 and GB 14746.

2 Normative references

The following referenced documents are indispensable for the application of this

document. For dated references, only the edition cited applies. For undated references,

the latest edition of the referenced document (including any amendments) applies.

CIE 15, Colorimetry

CIE 1931, Color Space

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

4 General

5 Optical requirements

6 Chromatic requirements

When testing according to the method described in Chapter 9, the color of the reflected

light shall be within the range defined by the CIE chromaticity coordinates given in

Table 8.

NOTE. For ease of reference, these areas have been marked in Figure 2.

7 Physical requirements