Hi*Tech has over 18,000 variable message sign displays installed worldwide. Key variable message sign accounts include various DOT and Bridge authorities, airports including FIDS and BIDS displays in Miami, Newark, San Diego, full color signage advertising and special events installations, Factory Automation applications, and Passenger Rail Systems. Circuit boards, populated with LED's are mounted in an environmentally controlled, welded aluminum cabinet, behind a punched aluminum and UL approved polycarbonate face. This allows LED variable message sign displays to be manufactured in almost limitless size proportions, yet have appropriate fans and heaters in each module.