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.

NOTE: In order to allow for future developments in technology and sign design, this Standard defines performance requirements that are not dependent on technology and whose optical performance may be determined using a test module.