Standard
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AS 5156-2010
[Superseded]Electronic speed limit signs
This Standard covers electronic speed limit signs composed of discrete light-emitting elements intended to be permanently mounted or portable, adjacent to or over roadways, for the primary purpose of communicating speed restrictions to approaching road users. It specifies requirements for the design, construction, performance and certain aspects of the installation of electronic speed limit signs, including their associated control systems.
Published: 03/12/2010
Pages: 64
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 Referenced documents
1.4 Definitions
1.4.1 General
1.4.2 Definitions
2 Display and optical requirements
2.1 Display requirements
2.1.1 General
2.1.1.1 Display characteristics
2.1.1.2 Light output
2.1.1.3 Numeric display changes
2.1.1.4 Display changes due to facility switch operation
2.1.1.5 Display colours
2.1.1.6 Sign dimming control
2.1.1.6.1 General
2.1.1.6.2 Monitoring of automatic dimming control
2.1.1.6.3 Time-based dimming control
2.1.1.6.4 Fixed dimming control
2.1.1.7 Conspicuity devices
2.1.1.8 Display flicker
2.1.1.8.1 General
2.1.1.8.2 Energized pixels
2.1.1.8.3 Pixel checking
2.1.2 Pixel arrangement
2.1.2.1 Pixel interspersion
2.1.2.2 Annulus
2.1.2.3 Matrix display signs
2.1.2.4 Discrete character signs
2.1.2.5 Annulus display
2.1.3 Pixel/LED
2.1.3.1 Pixel service life
2.1.3.2 Reliability
2.1.3.3 Pixel modules
2.1.3.4 LEDs
2.2 Optical requirements
2.2.1 Luminance and luminance ratio
2.2.2 Luminous intensity uniformity
2.2.3 Colours
3 Operation and control
3.1 General
3.1.1 Host control
3.1.2 Display activation
3.1.3 Testing and verification
3.2 Local manual control
3.2.1 Product Host Control System
3.2.2 Facility switch
3.3 Remote control
3.4 Programming
3.5 Communications protocol
3.6 Monitoring, fault logging and reporting
3.7 Fall-back operation
3.8 Software development
3.9 Operation and maintenance manual
4 General design and arrangement
4.1 Mechanical requirements
4.1.1 General
4.1.2 Sign enclosure
4.1.3 Sign mounting facilities
4.1.4 Control housing
4.1.4.1 Construction and positioning
4.1.4.2 Anti-vandalism measures
4.1.4.3 Power and communications equipment
4.1.5 Facility switch
4.1.5.1 General
4.1.5.2 Control housing
4.1.5.3 Type and rating
4.1.5.4 Mounting
4.1.5.5 Marking
4.2 Electrical requirements for mains operated signs
4.2.1 Compliance with wiring Standards
4.2.2 Operating voltage
4.2.3 Battery backup
4.2.4 Surge protection
4.3 Design life
4.4 Solar power
4.5 Communications equipment
4.6 Real-time clock
4.7 Markings and labels
5 Environmental requirements
5.1 Temperature and humidity
5.2 Enclosure protection
5.3 Wind loading
5.4 Shock protection
5.4.1 Shock
5.4.2 Vibration
5.5 Electromagnetic compatibility (EMC)
5.5.1 Immunity
5.5.2 Electromagnetic emissions
Appendix A
A1 General
A2 Test procedures for luminance measurement
A2.1 General
A2.2 Luminance measurement of annulus segment
A2.3 Luminance measurement of the numerals
A2.3.1 Luminance measurement of full matrix speed signs
A2.3.2 Luminance measurement of speed signs with discrete characters
A2.4 Normalization of results
A2.4.1 Normalized luminance
A2.4.2 Test procedure for determination of CF for numerals and the annulus
A3 Test procedures for luminance ratio measurement
A3.1 Solar stimulation
A3.2 Luminance ratio of annulus
A3.3 Luminance ratio of measurement of the legend
A3.3.1 Luminance ratio of matrix
A3.3.1.1 Alternative A
A3.3.1.2 Alternative B
A3.3.2 Luminance ratio of speed signs with discrete characters
A3.4 Luminance ratio of conspicuity device
A3.4.1 General
A3.4.2 Alternative A
A3.4.3 Alternative B
A4 Test procedures for luminous intensity half-angle measurement
A4.1 Luminous intensity half-angle of the annulus
A4.2 Luminous intensity half-angle of the numeral display
A5 Test procedures for luminous intensity uniformity
A6 Test procedures for conspicuity devices
A6.1 Luminous intensity of conspicuity device
A6.2 Luminous intensity of half-angle of conspicuity device
A7 Test procedures for photosensors
A7.1 General
A7.2 Test procedures for measurement of photosensors
A8 Colorimetric test procedures
Appendix B
B1 General
B2 Display requirements
B2.1 Display changes
B2.2 Display changes due to facility switch operation
B2.3 Display changes due to external switch inputs
B2.4 Graphics requirements
B3 Programming
B4 Frame, message numbering and display images
B4.1 Graphics requirements
B4.2 Message numbering for speed displays
B4.3 Frame numbering for other displays
B4.4 Message numbering for other displays
B4.5 Standard bitmap display images
B4.6 Bitmap definitions for other displays
Appendix C
C1 Sign clearances
C2 Sign access
Appendix D
Cited references in this standard
[Current]
Electromagnetic compatibility (EMC), Part 6.1: Generic standards — Immunity for residential, commercial and light industrial environments
[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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