Specifications include, but are not limited to: The Message Sign is a solar powered portable dynamic message sign. The Message Sign consists of a sign display panel, a supporting structure for the sign display panel, a photovoltaic array, a battery power supply, an energy management system control unit and an electronic control console, all mounted on a heavy-duty trailer frame. 1.2 Design Objectives 1.2.1 Maximize reliability by using generally accepted design techniques for outdoor-use electrical and electronic equipment. 1.2.2 Minimize operating cost by using a renewable energy source, requiring minimal maintenance. 1.2.3 Maximize safety and effectiveness by using a non-glare, high contrast display panel with long-life expectancy, high-reliability display technology. 1.2.4 Meet or exceed the standards for Portable Changeable Message Signs as listed in the U.S. Federal Highway Administration (FHWA) Manual on Uniform Traffic Control Devices (MUTCD). 1.3 Performance Objectives 1.3.1 Visibility up to 1 mile. 1.3.2 Legibility up to 1/2 mile. 1.3.3 Minimal glare from sunlight and headlights. 1.3.4 Continuous, uninterrupted operation on solar power. 1.3.5 One month minimum, three-month typical maintenance interval.