Abstract: A digital communication system is disclosed, that allows a display of override content to interrupt a display of ongoing content on one or more display units. Ongoing content, such as advertisements, news, entertainment, or other relevant information, is provided on the display units until an urgent or security-related alert is required, and display of override content becomes necessary. Override content can include information relevant to the security of a passenger or passer-by viewing the display. Override content can relate to security threats such as accidents, major delays, fire, missing children, terrorist activity, or other content deemed adequately pertinent to warrant interrupting the display of ongoing content.

Abstract: An advertising system for displaying adaptive advertisements that can change the displayed content in response to external inputs can be used in public places such as transit stations, arenas, stadiums, retail stores, and squares. The advertising system can also be deployed in transit vehicles. The advertisements make use of a decision engine to select from a plurality of advertising scenarios to generate the content that is rendered on displays. The system has a processor that executes the decision engine and provides the decision engine with the external inputs, such as time of day, weather conditions and forecast, current, past or next transit station, required to select one of the stored advertising scenarios. These input scenarios can be either stored by the system or obtained in real-time. A system for distributing advertisement content to displays for playback based on the correlation between the attributes of the Content, attributes of the displays, and other factors.