These large message boards display letters, symbols and designs activated by remote control by the traffic control centers. They can vary the information on the entire display area. The display elements use light emitting diodes which allow color to be used (red, yellow-green, orange), save electricity (uses 2/3 of electricity of small light bulbs), and lengthen board life. There are also high precision models with closely spaced display elements for providing information with complicated designs and illustrations.
