Standard
Track updates
AS 5156:2020
[Current]Electronic speed limit signs
Specifies requirements for the design, construction and performance of electronic speed limit signs (ESLS) based on light-emitting diode technologies. ESLS are intended for use in road traffic management.
Published: 11/09/2020
Pages: 39
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope and general
1.1 Scope
1.2 Application
1.3 Normative references
1.4 Terms and definitions
2 General design and arrangement
2.1 General
2.2 Design life
2.3 Markings and labels
3 Mechanical requirements
3.1 Sign enclosure
3.2 Sign mounting facilities
3.3 Roadside cabinet
3.3.1 Application
3.3.2 Construction and finish
3.3.3 Access doors
3.3.4 Ventilation
3.3.5 Protection against vandalism
3.3.6 Contents
3.4 Facility switch
3.4.1 Application
3.4.2 Type and rating
3.4.3 Mounting
3.4.4 Marking
4 Electrical requirements
4.1 Conforming to wiring Standards
4.2 Operating voltage
4.2.1 General
4.2.2 Battery backup
4.2.3 Lightning protection
4.3 Solar power
4.4 Communications equipment
4.5 Real-time clock
4.6 Electromagnetic compatibility (EMC)
4.6.1 Immunity
4.6.2 Electromagnetic emissions
5 Display and optical requirements
5.1 Display requirements
5.1.1 General
5.1.1.1 Display characteristics
5.1.1.2 Luminance output
5.1.1.3 Display colours
5.1.1.4 Pixel service life
5.1.1.5 Maintainability
5.1.2 Pixel arrangement
5.1.2.1 Pixel interspersion
5.1.2.2 Annulus
5.1.2.3 Numerals
5.1.2.4 Pixel lit area
5.1.2.5 Discrete numeral signs
5.1.2.6 Annulus display
5.1.3 Synchronisation of numeric display changes
5.1.4 Display changes due to facility switch operation
5.1.5 Display changes due to external inputs
5.1.6 Sign dimming control
5.1.6.1 General
5.1.6.2 Monitoring of automatic dimming control
5.1.6.3 Time-based dimming control
5.1.6.4 Fixed dimming control
5.1.7 Conspicuity devices
5.1.8 Display flicker
5.2 Optical requirements
5.2.1 Luminance and luminance ratio
5.2.2 Luminance matching of colours
5.2.3 Luminous intensity uniformity
5.2.4 Colours
5.2.5 Flashing annulus
6 Operation and control
6.1 General
6.2 Local control
6.3 Remote control
6.4 Programming
6.5 Communications protocol
6.6 Monitoring, fault logging and reporting
6.7 Fall-back operation
6.8 Software development
6.9 Operation and maintenance manual
7 Environmental requirements
7.1 Temperature and humidity
7.2 Enclosure protection
7.3 Wind loading
7.4 Vibration
Appendix A
A.1 General
A.2 Test procedures for luminance ratio measurement
A.2.1 General
A.2.2 Luminance ratio of annulus
A.2.3 Luminance ratio of numeral matrix
A.2.3.1 General
A.2.3.2 Alternative A
A.2.3.3 Alternative B
A.2.3.4 Luminance ratio of speed signs with discrete numerals
A.2.4 Luminance ratio of conspicuity device
A.2.4.1 General
A.2.4.2 Alternative A
A.2.4.3 Alternative B
A.3 Test procedures for luminance measurement
A.3.1 General
A.3.2 Luminance measurement of annulus segment
A.3.3 Luminance measurement of the numerals
A.3.3.1 Luminance measurement of matrix speed signs
A.3.3.2 Luminance measurement of speed signs with discrete numerals
A.3.4 Normalization of results
A.3.4.1 Normalized luminance
A.3.4.2 Test procedure for determination of CF for numerals and the annulus
A.4 Test procedures for luminous intensity half-angle measurement
A.4.1 Luminous intensity half-angle of the annulus
A.4.2 Luminous intensity half-angle of the numeral display
A.5 Test procedures for luminous intensity uniformity
A.6 Test procedures for conspicuity devices
A.6.1 Luminous intensity of conspicuity device
A.6.2 Luminous intensity of half-angle of conspicuity device
A.7 Colorimetric test procedures
Appendix B
Bibliography
Cited references in this standard
AS 1742
Manual of uniform traffic control devices
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