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A passenger information [display] system is an automated system for supplying users of public transport with information about the nature and state of a public transport service, through visual, voice or other media. They are also known as Customer Information Systems and Operational Information Systems. Among the information provided by such systems, a distinction can be drawn between:Static or schedule information, which changes only occasionally and is typically used for journey planning prior to departure. Real time information, derived from automatic vehicle location systems, which changes continuously as a result of real-world events and is typically used during the course of a journey.