The Matrix Indicator is used to warn motorists of hazards ahead, such as an advisory speed limit, fog, a queue of traffic, denoted as a letter Q or a lane closure on a three lane motorway. Such signs can either be post or gantry mounted.

• Full matrix of yellow, three pixels per LED
• Red cross and a green arrow incorporated
• Typical dimensions from 280mm x 330mm (11” x 13”) to 580mm x 680mm (23" x 28") display area
• Post or gantry mounted

The table right is an example of a selection of road signs which could be achievable with such a lane controller.