The cantilever variable information sign is installed in the main road of expressway and the important traffic entrance and exit road survey position. It is the important information release equipment of the expressway monitoring system. According to the instructions of the traffic, weather and command and dispatch department, the monitoring and management center can timely release the traffic guidance information, weather and road conditions ahead, festival warm banner and other contents. It can provide important information to the driver conveniently and effectively for the monitoring and management personnel. And provide a variety of display and mobile mode, multiple information can be displayed alternately, mobile display speed Settings, display brightness automatic adjustment, up to 99 preset fixed display programs, simple and efficient call display. Can be customized according to customer needs.