GB/T 31446-2015LED active light-emitting road traffic signs (English PDF)

3.4 Static distinguishing distance

It refers to, in the sunny day when the ambient illuminance is more than 50000 lx AND the sunlight directly irradiates on the front surface of the sign, the maximum distance at which the observer (normal person, corrected visual acuity 1.0 or more) can correctly distinguish the sign information within the specified viewing angle.

3.5 Dynamic distinguishing distance

It refers to, in the sunny day when the ambient illuminance is more than 50000 lx, the sunlight directly irradiates on the front surface of the sign, AND the driving speed is 120 km/h, the maximum distance at which the observer (normal person, corrected visual acuity 1.0 or more) can correctly distinguish the sign information within the specified viewing angle.

3.6 Standard test conditions for solar cell

The standard test conditions for solar cells are. ambient temperature (25 ± 2) °C; the irradiance of light source as measured using the standard solar cell is 1000 W/m²; AND it has standard solar spectral irradiance distribution.

3.7 Full charge

It refers to a state of battery charging under which, even though the charging is conducted at the selected conditions, all the available active substances will not significantly increase the capacity.

3.8 Full capacity work time

Tcf25, Tcf0 It refers to the continuous and effective work time of the solar powered light-emitting traffic signs which can be guaranteed by the fully charged battery pack under the conditions that the charging circuit is disconnected. The subscript number of Tcf25 and Tcf0 refers to the work environment temperature.

5.1 Applicable conditions

5.1.1 Installation environment. outdoors

5.1.2 Relative humidity. not more than 98%

5.1.3 Ambient temperature

- Grade A. -20 °C ~ +55 °C;

- Grade B. -40 °C to +50 °C;

- Grade C. -55 °C ~ +45 °C.

5.2 Material requirements

5.2.1 Such structural parts of the light-emitting signs as enclosure and baseplate, etc., shall, under the conditions of ensuring the structural stability, use the light metal or non-metal materials which comply with GB/T 23827, in order to reduce product weight and corrosion resistance ability.

5.2.2 The normal luminous intensity of single-type LED at the rated current. red is not less than 5000 mcd, yellow is not less than 3000 mcd, white is not less than 6000 mcd; AND the LED half-intensity angle theta 1/2 is not less than 12.5 °.

5.2.3 The performance of the retro-reflective materials as used for the light-emitting signs shall comply with the relevant requirements of GB/T 23827.

5.2.4 The mean time between failures MTBF of the LED shall be not less than 50000 h, AND the MTBF of other electronic components shall be not less than 30000 h.

5.3 Sign layout

5.3.1 The shape, dimension, pattern of the light-emitting signs AND the character and color of the retro-reflective material shall comply with the relevant requirements of GB 5768.2. AND the sign information as shown on the active light-emitting unit and the retro-reflective material baseplate shall be consistent.

5.3.2 The color of the active light-emitting unit of different types of road traffic signs shall comply with the requirements below.

- The color of the active light-emitting unit of the warning sign and the work area sign is yellow;

5.5.2 Chromaticity performance of retro-reflective materials

The chromaticity indicators of the retro-reflective material for the light-emitting sign shall comply with the requirements of GB/T 23827.

5.6 Dimming function

The light-emitting sign product shall have the environmental illumination detection device, AND be able to, based on the environmental illumination, automatically adjust the brightness of the light-emitting sign, in order to avoid glare when the environmental illumination is relatively low.

5.7 Distinguishing performance

5.7.1 Distinguishing distance

The distinguishing distance of the light-emitting sign is divided into static distinguishing distance and dynamic distinguishing distance, the requirements are as follows.

a) The static distinguishing distance shall not be less than 250 m;

b) The dynamic distinguishing distance shall not be less than 210 m.

5.7.2 Viewing angle

Under the conditions as specified in 5.7.1, the viewing angle of the light-emitting sign product shall be not less than 30 °.

5.7.3 Light-emitting uniformity

The light emitted from the active light-emitting unit of the sign shall be uniform, AND under the rated operating current, the un-uniformity of the normal light-emitting intensity between the pixels of the same-color active light-emitting unit within the entire range of the sign shall be not more than 10%.

5.8 Electrical safety performance of power grid powered signs

5.8.1 Insulation resistance. the insulation resistance between the power supply terminal and the enclosure of the light-emitting sign product shall not be less than 100 M ohm.

5.8.2 Electrical strength. between the power supply terminal and the enclosure of the light-emitting sign product, if applying the sinusoidal AC voltage for which the frequency is 50 Hz AND the effective voltage is 1500 V, after 1 min, it shall be free from spark, flashover or breakdown, AND the leakage current shall be not more than 5 mA.

It is preferable for the light-emitting sign product to use the light metal (such as aluminium alloy) or steel metal trim, AND the product shall be stable in structure; under the wind pressure generated by the 40 m/s wind, the utilization performance of the product will not be affected, AND the resulting geometric deformation shall not be greater than 2 mm. […]

5.11 Environmental adaptability

5.11.1 Low temperature performance