IST International's Advanced Changeable Message Sign family includes Changeable Variable or Text Message Signs. Street Name pulse information on traffic, detours, event management, emergency, status, open/close and anything in between. Available with Advance wireless intersection preemption “AWIPS” Preemption-Traffic signals. Display a message along with the emergency through green, or stop all red. Open Lane, Emergency Vehicle Ahead, displayed and more. Use 4, 8, 16 or more text or numeric characters of information. Perfect for EMS, public works, traffic management, HLS, police & military. For event management, amber alerts, evacuation . Multiple units can be networked for wireless communication and traffic flow.