Standard
Track updates
AS 4852.1:2019
[Current]Variable message signs, Part 1: Fixed signs
This Standard specifies the requirements for the design, construction, performance and certain aspects of the installation of electrically powered, variable message signs, including their associated control systems.
Published: 13/12/2019
Pages: 37
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 Design
2.1 General
2.2 Design life
2.3 Markings and labels
2.3.1 General
2.3.2 On sign controller
2.3.3 On inside of sign controller housing
2.3.4 On rear of sign controller housing
3 Mechanical requirements
3.1 Sign enclosure
3.1.1 Construction material
3.1.2 Surface finish
3.1.3 Viewing area
3.1.4 Access doors
3.1.5 Double-socket outlet
3.1.6 Mounting
3.1.7 Border
3.2 Roadside cabinet
3.2.1 General
3.2.2 Construction and finish
3.2.3 Access doors
3.2.4 Ventilation
3.2.5 Protection against vandalism
3.2.6 Provisions
3.2.7 Facility switch
3.2.7.1 General
3.2.7.2 Type and rating
3.2.7.3 Mounting
3.2.7.4 Marking
4 Electrical requirements
4.1 Conformance to standards
4.2 Operating voltage
4.3 Battery backup
4.4 Lightning protection
4.5 Electromagnetic compatibility (EMC)
4.5.1 Immunity
4.5.2 Electromagnetic emissions
4.6 Communications equipment
4.7 Real-time clock
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 Pixel arrangement
5.1.1.4 Pixel element service life
5.1.1.5 Maintainability
5.1.2 Display dimensional requirements
5.1.2.1 Text and spacing
5.1.2.2 Pixel lit area
5.1.3 Light axis
5.1.4 Character formats
5.1.4.1 General
5.1.4.2 Font Shapes
5.1.4.3 Justification
5.1.5 Display changes
5.1.6 Display changes due to facility switch operation
5.1.7 Display changes due to external inputs
5.1.8 Graphics requirements
5.1.9 Sign dimming control
5.1.9.1 General
5.1.9.2 Monitoring of automatic dimming control
5.1.9.3 Time-based dimming control
5.1.9.4 Fixed dimming control
5.1.10 Conspicuity devices
5.1.11 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
6 Operation and control
6.1 General
6.2 Local control
6.3 Remote control
6.4 Non-volatile memory capacity
6.5 Programming
6.6 Communications protocol
6.7 Monitoring, fault logging and reporting
6.8 Fall-back system
6.9 Software development
6.10 Operations and maintenance manual
7 Environmental requirements
7.1 Temperature and humidity
7.2 Enclosure protection
7.3 Wind loading
Appendix A
A.1 Sign clearances
A.2 Sign access
Appendix B
Appendix C
C.1 General
C.2 Test procedures for luminance ratio measurement
C.3 Test procedures for luminance measurements
C.4 Test procedures for luminous intensity uniformity
C.5 Test procedures for luminous intensity half-angle
Appendix D
Bibliography
Cited references in this standard
[Current]
Characterization of the performance of illuminance meters and luminance meters
[Current]
Manual of uniform traffic control devices, Part 1: General introduction and index of signs
[Current]
Electromagnetic compatibility (EMC), Part 6.3: Generic standards — Emission standard for equipment in residential environments (IEC 61000-6-3:2020 (ED 3.0) MOD)
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