Standard
Track updates
AS 2144:2023
[Current]Traffic signal lanterns
AS 2144:2023 specifies requirements for the design, construction and performance of traffic signal lanterns that use light emitting diode (LED) light sources and control the movement of vehicles, including bicycles, and pedestrians.
Published: 22/12/2023
Pages: 76
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Introduction
1 Scope and general
1.1 Scope
1.2 Normative references
1.3 Terms and definitions
1.4 Marking
1.5 Testing
2 Signal colours and displays
2.1 Signal colours
2.2 Signal displays
3 Photometric performance
3.1 General
3.2 Appearance of vehicular aspects with a circular display
3.3 Luminous intensity distribution of vehicular aspects with a circular display
3.3.1 Background technical information
3.3.2 General conditions and exceptions
3.3.2.1 Non installation-related information
3.3.2.2 Installation-related information
3.3.3 Vehicular aspects with a circular display
3.3.4 Additional requirements for HPSM LEDs
3.3.5 Other technologies
3.4 Appearance of vehicular aspects that display symbols
3.5 Luminance distribution of vehicular aspects that display symbols
3.5.1 Background technical information
3.5.2 Luminance
3.6 Appearance of pedestrian and bicycle aspects that display symbols
3.7 Luminance distribution of pedestrian and bicycle aspects that display symbols
3.7.1 Diffused aspects
3.7.2 Non-diffused aspects
3.8 Pedestrian countdown timer
3.8.1 Physical requirements
3.8.2 Display requirements
3.8.3 Operational requirements
3.8.3.1 Start up
3.8.3.2 General operation
3.8.3.3 PCT fault operation
3.9 Veiling reflections
3.10 Sun-phantom
3.11 Flicker test
4 Mechanical and physical features and properties
4.1 General arrangement
4.1.1 Size and arrangement of aspects
4.1.2 Mounting facilities
4.1.3 Access to optical system
4.1.4 Provision for adjustment
4.1.5 Controlling dimensions for vehicular lanterns
4.2 Mass of lantern aspects
4.3 Sealing of optical system
4.4 Materials and methods of construction
4.5 Surface finish
4.6 Weather resistance
4.6.1 Drainage facilities
4.6.2 Required protection
4.7 Operating temperatures
4.8 Environmental tests
5 Electrical requirements
5.1 Conformance to AS/NZS 3100
5.2 Supply voltage
5.2.1 Low-voltage (LV) operation
5.2.2 Extra low-voltage (ELV) operation
5.2.3 Dual voltage operation
5.2.4 DC voltage operation
5.3 Provision of connection to supply
5.3.1 Supply conductors
5.3.2 Terminals for the connection of supply conductors
5.4 Built-in transformers
5.5 Design and general
5.5.1 Separation of aspects
5.5.2 Off voltage
5.5.3 Provision for aspect monitoring
5.5.3.1 Current waveform
5.5.3.2 Power factor
5.5.3.3 Power consumption
5.5.4 Shut down mode
5.5.5 Dimming
5.5.5.1 General
5.5.5.2 Dimming characteristics
5.5.5.3 Dimming Methods
5.5.6 Hysteresis zone
5.5.7 Electromagnetic compatibility
5.5.7.1 Immunity
5.5.7.2 Electromagnetic emissions
5.6 Components and construction
5.6.1 Derating
5.6.2 Drive current
6 Operational requirements
6.1 General
6.2 Light output states
6.3 Signal switching response times
6.4 Progressive failure of aspects
6.5 Dimming of aspects
7 Optical system components and ancillary devices
7.1 Assembly of optical system
7.2 Properties of optical components
7.2.1 Material and construction
7.2.2 Colour stability
7.3 Display of symbols
7.4 Visors and louvres
7.5 Target boards for vehicular lanterns
7.6 Anti-sun-phantom devices
Appendix A
Appendix B
B.1 General test conditions
B.1.1 Lantern
B.1.2 Test voltage and current
B.1.3 Arrangement of the lantern
B.2 Calibration and measurement conditions
B.2.1 General
B.2.2 References for measurements
B.2.3 Stray light
B.2.4 Additional conditions and procedures
B.2.4.1 Temperature requirements
B.2.4.2 Normalization of results — Measurements required
B.2.4.2.1 Measurements required for yellow aspects only
B.2.4.2.2 Measurements required for all aspects
B.2.4.3 Normalization of results — Calculations required
B.2.4.3.1 Temperature correction factor — All aspect colours
B.2.4.3.2 One minute correction factor — Yellow aspects only
B.3 Measurement procedures
B.3.1 Determination of beam axis
B.3.2 Chromaticity
B.3.3 Luminous intensity
B.3.4 Luminance
B.3.4.1 Diffused aspects that display symbols
B.3.4.2 Aspects that display symbols and are not fitted with a diffuser
B.3.5 Sun-phantom
B.3.6 Veiling reflection
B.3.6.1 General
B.3.6.2 Measurement set-up
B.3.6.3 Measurement procedure
B.3.6.4 Results
B.3.7 Test procedures for PCT luminous intensity uniformity
Appendix C
C.1 Scaling factor
C.2 Example derivations of required initial axial luminous intensities for 5 mm LEDs
C.2.1 LED general purpose red aspect
C.2.2 LED general purpose green aspect
C.2.3 LED general purpose yellow aspect
Appendix D
D.1 Scope
D.2 Dimensions for visors
D.3 Dimensions for target board attachment
Bibliography
Cited references in this standard
IEEE 1789
Recommended practices for modulating current in high-brightness LEDs for mitigating health risks to viewers
ANSI/IES TM-21
Projecting Long-Term Luminous, Photon, and Radiant Flux Maintenance of LED Light Sources
ANSI/IES LM-80
Approved Method: Measuring Luminous Flux and Color Maintenance of LED Packages, Arrays, and Modules
CIE 233
Calibration, characterization and use of array spectroradiometers
CIE 018
The basis of physical photometry
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