GB 4785-2019Prescription for installation of the external lighting and light-signalling devices for motor vehicles and their trailers (English PDF)

4.6 For vehicles with asymmetrical shapes, the requirements of

4.5 shall also be met as far as possible.

4.7 A single lamp, grouped lamps, combined lamps, and reciprocally incorporated lamps shall meet the following requirements.

a) The lamps, in accordance with their respective light colors, installation positions, orientations, geometric visibility, circuit connections, and other requirements, can be grouped, combined, or incorporated with each other. It shall meet the following requirements.

4.8 The maximum ground clearance shall be measured from the highest point of the apparent surface in the direction of reference axis. The minimum ground clearance shall be measured from the lowest point of the apparent surface in the direction of reference axis. (If the installation position clearly meets the requirements of this Standard, it is not necessary to determine the precise edge of any surface.) Except for the following cases.

4.9 Without special instructions, during the operation of lamp, its optical characteristics (such as. light intensity, color, apparent surface, etc.) must not be changed at will. Except in the following cases.

4.10 For the lamps defined in 3.9, no red light shall be observed from the front of the vehicle; no white light shall be observed from the rear of the vehicle (except for vehicle interior lamps). If there is any objection, it shall be inspected according to the following methods.

4.11 The circuit connection shall ensure that the front position lamp, rear position lamp, end-outline marker lamp (if installed), side marker lamp (if installed), rear-registration plate illuminating device, and marker lamp for draw- bar-trailer can only be turned on or off at the same time. Except in the following cases.

4.12 The circuit connection shall ensure that the main-beam headlamp, passing-beam headlamp, and front fog lamp can only be turned on when the lamps in

4.11 above are turned on. However, when the main-beam headlamp and passing-beam headlamp are used as warning signals, the above situation does not apply (i.e., the main-beam headlamp or passing-beam headlamp is turned on intermittently, or the main-beam headlamp and passing-beam headlamp are turned on alternately intermittently). When the following requirements are met, the passing-beam headlamp and/or main-beam headlamp and/or front fog lamp can replace the functions of the front position lamp.

4.13 The "closed-circuit" tell-tale in this Standard may be replaced by an "operating" tell-tale.

4.14 For concealable lamps, the following requirements shall be met.

4.16 The number of lamps installed on the vehicle shall meet the corresponding requirements in Clause

5 Special regulations.

4.17 The illuminating surface of a light-signalling device other than a retro- reflector is determined as follows:

4.27

b) above are not applicable.

d) In the type test materials, documents shall be provided to demonstrate methods and results used by compliance.

4.28 The geometric visibility of lamps is generally required in the following manner.

a) When viewed from a distance, within the range of geometric visibility, there shall be no obstacles that hinder the propagation of the light rays emitted from the apparent surface. If obstacles already exist in the previous type test of lamps, these obstacles within the geometric visibility may be ignored.

b) If measured near the lamp, move in parallel along the observation direction to get the same accuracy.

c) If the apparent surface of the lamp is partially covered by vehicle components when mounting the lamp, proof shall be provided to show that the unshaded part of the lamp still meets the photometric value required for type test.

d) For lamps with an installation height of less than 750 mm from the ground [For measurement method, refer to

4.8 a)], the downward geometric visibility can be reduced to 5°. Its corresponding photometric measurement range can also be reduced to 5°.

e) For an interdependent lamp system, the geometric visibility shall be measured when all the interdependent lamps are turned on.

4.29 The area of the light emitting surface of all rear position lamps, rear direction-indicator lamps, and stop lamps of trucks, special operation vehicles, and trailers with a total mass of not less than 4500 kg shall be not less than the area of a circle of 80 mm diameter. If the light emitting surface is not circular, its shape shall be able to accommodate a circle of 40 mm diameter.

4.30 The LED module is non-replaceable.

4.31 When the vehicle is stationary and one or more of the following conditions are met, external lighting and light-signalling devices not defined in this Standard may be turned on; but the effectiveness of external lighting and light- signalling devices defined in this Standard must not be jeopardized.

5.5 Direction-indicator lamp (lamp which meets the requirements of GB 17509)

5.5.1 Equipping It shall be equipped, as shown in Figure 2 a). The direction-indicator lamps can be divided into the following categories (1, 1a, 1b, 2a, 2b, 5, and 6). Layout A and Layout B can be formed by installation on the vehicle.

5.6 Hazard warning signal

5.6.1 Equipping It shall be equipped. Hazard warning signals shall be sent by the simultaneous operation of the direction-indicator lamp in accordance with 5.5.

5.6.2 Number According to 5.5.2.

5.6.3 Layout According to 5.5.3.

5.6.4 Installation position

5.6.4.1 Horizontal. according to 5.5.4.1.

5.6.4.2 Height. according to 5.5.4.2.

5.6.4.3 Vertical. according to 5.5.4.3.

5.6.5 Geometric visibility According to 5.5.5.

5.6.6 Direction According to 5.5.6.

5.6.7 Circuit connection

5.6.7.1 Hazard warning signals shall flash simultaneously by turning on each direction-indicator lamp by separately-configured manual switches.

5.6.7.2 After a vehicle collision or the emergency stop signal specified in

5.23 is turned off, the hazard warning signal is allowed to turn on automatically. In this case, it shall be possible to turn off the signal manually. In addition, hazard warning signals are allowed to turn on automatically to indicate possible hazards to other road users. At this time, the signal shall remain on until it is turned off manually or automatically.

5.6.7.3 For M1 and N1 vehicles with a length of less than 6 m, the layout conforms to 5.5.5.2.If an amber side marker lamp is installed, the lamp shall also flash in phase at the same frequency as the direction-indicator lamp.

5.7.2 Number

5.7.2.1 For various types of vehicles, two S1 or S2 stop lamps and one S3 or S4 stop lamp.

5.7.2.2 Except where S3 or S4 stop lamps are installed, M2, M3, N2, N3, O2, O3, and O4 vehicles can be equipped with two optional S1 or S2 stop lamps.

5.7.2.3 When the longitudinal symmetry plane of the vehicle is not located on a fixed body panel but on a movable component, one or two movable components (such as doors) which separate the vehicle, and there is not enough space installing a S3 or S4 stop lamp on the moving components on the longitudinal symmetry plane, then two S3 or S4 stop lamps marked "D" can be installed. Or at a position that deviates left and right from the longitudinal symmetry plane of the vehicle, install a S3 or S4 stop lamp. Or, install an interdependent lamp system of S3 or S4 stop lamps.

5.7.3 Layout There are no special requirements.

5.7.4 Installation position

5.7.4.1 Horizontal For M1 and N1 vehicles. For S1 or S2 stop lamps, the distance from the point on the apparent surface in the direction of reference axis farthest from the longitudinal symmetry plane of the vehicle to the extreme outer edge of the vehicle shall not be greater than 400 mm. There are no special requirements for the distance between the respective inner edges of the apparent surface in the direction of the reference axis. For all other vehicles. - Category S1 or S2 stop lamps. The distance between the inner edges of the apparent surface in the direction of reference axis shall not be less than 600 mm. If the overall width is less than 1300 mm, it can be reduced to 400 mm. - Category S3 or S4 stop lamps. The centre of reference shall be located on the longitudinal symmetry plane of the vehicle. However, in the case of installing two S3 or S4 stop lamps according to 5.7.2, it is required that the two lamps are as close to the longitudinal symmetry plane of the vehicle as possible and are located on both sides of the longitudinal symmetry plane of the vehicle respectively. - In the case of installing one S3 or S4 stop lamp according to

13.5 V (12 V system), or

28.0 V (24 V system). It is allowed that the device itself has a terminal maximum voltage control function.

c) For lamps with a light source control or variable intensity control, the provisions of