This Standard covers electrically powered, on-road, variable message signs used for traffic management and/or driver information applications. Part 1 of the Standard covers Fixed Signs, where the display is mounted in a permanent position above or adjacent to the roadway. Part 2 of the Standard covers Portable Signs, where the display is mounted and deployed on a relocatable trailer.
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
2 General design and arrangement
2.1 Mechanical requirements
2.1.1 General arrangement
2.1.2 Sign enclosure
2.1.3 Controller enclosure
2.1.4 Battery storage enclosure
2.1.5 Trailer
2.2 Electrical requirements
2.2.1 Power supply
2.2.2 Automatic shutdown and restart
2.3 Security
2.4 Markings and labels
3 Display and optical requirements
3.1 Display requirements
3.1.1 General
3.1.2 Display dimensional requirements
3.1.3 LED
3.1.4 LED arrangement
3.1.5 Dimming
3.1.6 Display flicker
3.2 Optical requirements
3.2.1 Luminance and luminance ratio
3.2.2 Luminous intensity uniformity
3.2.3 Colours
4 Operation and control
4.1 General
4.2 Local control
4.3 Remote control
4.4 Programming
4.5 Communications protocol
4.6 Monitoring, fault logging and reporting
4.7 Fall-back system
4.8 Software development
4.9 Operations and maintenance manual
5 Environmental requirements
5.1 Temperature and humidity
5.2 Enclosure protection
5.3 Wind loading
5.4 Electromagnetic compatibility (EMC)
5.4.1 Immunity
5.4.2 Electromagnetic emissions
Appendix A
A1 General
A2 Test procedures for luminance ratio measurement
A3 Test procedures for luminance measurements
A4 Test procedures for luminous intensity uniformity
A5 Test procedures for luminous intensity half-angle
