Standard Interface for Real-time Information
SIRI is a CEN Technical Standard that specifies a European interface standard for exchanging information about the planned, current or projected performance of real-time public transport operations between different computer systems.
SIRI It is divided into five parts, each compliant with CEN Transmodel:
- Part 1: Context and framework (CEN/TS 15531-1:2015);
- Part 2: Communications infrastructure (CEN/TS 15531-2:2015);
- Part 3: Functional service interfaces (CEN TS/15531-3:2015);
- Part 4: Functional service interfaces: Facility Monitoring (CEN/TS 15531-4:2011);
- Part 5: Functional service interfaces – Situation Exchange (CEN/TS 15531-05:2016)-
SIRI allows pairs of server computers to exchange structured real-time information about schedules, vehicles, and connections, together with general informational messages related to the operation of the services. The information can be used for many different purposes, for example:
- To provide real time-departure from stop information for display on stops, internet and mobile delivery systems;
- To provide real-time progress information about individual vehicles;
- To manage the movement of buses roaming between areas covered by different servers;
- To manage the synchronisation of guaranteed connections between fetcher and feeder services;
- To exchange planned and real-time timetable updates;
- To distribute status messages about the operation of the services;
- To provide performance information to operational history and other management systems.
Transmodel has been a fundamental input, more information can be found at https://www.vdv.de/siri.aspx.