This Standard covers electrically powered, on-road, variable message signs (VMS) used for traffic management and/or driver information applications. Part 1 of this series covers fixed signs, where the display is mounted in a permanent position above or adjacent to the roadway, and Part 2 of this series covers portable signs, where the display is mounted and deployed on a re-locatable trailer.
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.
The following types of message signs are not covered in this Standard:
(a) Passenger information signs at bus stops, on train stations etc.
(b) Variable message signs intended to advertise products and services to road users.
(c) Signs that are only capable of displaying either a single message or a blank face.