Introduction to SIRI

UTA is dedicated to providing free real-time developer API's to the UTA transit system. Instead of developing our own standard we chose to implement the SIRI standard.

SIRI (Service Interface for Real Time Information) is an XML standard covering a wide range of types of real-time information for public transportation. This standard is has been adopted by the European standards-setting body CEN. This standard is not owned by any one vendor or public transportation agency or operator. It has been adopted by a growing number of different projects by vendors and agencies around North America and Europe.

The fact that this standard is open and has growing adoption were the two main reasons why UTA chose to adopt it.

The SIRI web service calls implemented by UTA are:

  • VehicleMonitoring: real-time information about one vehilce or many vehicles on one route.
  • StopMonitoring: real-time information about vehicles serving a particular stop.
  • CloseStopMonitoring: a UTA extension to SIRI to allow for querying of stops closest to Latitude and Longitude.

You can find instructions on how to access these services below.

Change Logs

For a list of latest changes you can go here.


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