This standard specifies the technical requirements, test methods and inspection rules of photometric characteristics of direction indicators for motor vehicles and their trailers.
This standard applies to various direction indicators for vehicles of Categories M, N and O.
In this standard, the above direction indicators are also known as device.
2 Normative References
The following standards and documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, subsequent amendments to (excluding amending errors in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of the normative document is applicable. For undated references, the latest edition applies to this standard.
GB 4599 Motor Vehicle Headlamps Equipped with Filament Lamps
GB 4785 Prescription for Installation of the External Lighting and Light-signaling Devices for Motor Vehicles and Their Trailers
GB 15766.1 Filament Lamps for Road Vehicles - Dimensional, Electrical and Luminous Requirements (GB 15766.1-2000, idt IEC 60809: 1995)
ECE R37 Uniform Provisions Concerning the Approval of Filament Lamps for Use in Approved Lamp Units of Power-driven Vehicles and of Their Trailers
3 Terminologies and Definitions
For the purposes of this standard, the terminologies and definitions specified in GB 4785 apply.
4 Classification
4.1 Category of direction indicators
Specify the device category and light distribution minimum angle (see Figure 1) according to the installation position on vehicle and function:
a) Category 1 device: front direction indicator with the distance between installation position and dipped-beam headlamp or front fog lamp not less than 40mm;
b) Category 1a device: front direction indicator with the distance between installation position and dipped-beam headlamp or front fog lamp greater than 20mm but less than 40mm;
c) Category 1b device: front direction indicator with the distance between installation position and dipped-beam headlamp or front fog lamp not greater than 20mm;
d) Category 2a device: rear direction indicator installed at rear part of vehicle and with one-level light intensity;
e) Category 2b device: rear direction indicator installed at rear part of vehicle and with two-level light intensity;
f) Category 3 device: side-front direction indicator used in the occasion where vehicle is only equipped with side direction indicator of this category;
g) Category 4 device: side-front direction indicator used in the occasion where vehicle is equipped with device of category 2a or 2b;
