DIN CEN/TS 15531-2:2011-06

Public transport services rely increasingly on information systems to ensure reliable, efficient operation and widely accessible, accurate passenger information. This type of system covers the following specific purposes: setting schedules and timetables; managing vehicle fleets; issuing tickets and receipts; providing real-time information on service running, and so on. This Technical Specification specifies a Service Interface for Real-time Information (SIRI) about public transport. It defines exchange information between servers containing real-time public transport vehicle or journey time data. These include the control centres of transport operators and information systems that utilise real-time vehicle information, for example, to deliver services such as travel information.