Three prominent data standards have been developed in the transit industry:
SIRI is an extensible and modular standard allowing for C2C communications, agency-to-public communications, and agency-to-infrastructure communications. SIRI allows for the structured exchange of real-time information about schedules, vehicles, and connections with general informational messages related to the operation of the services. SIRI defines functional services including:
TCIP is an extensible and modular standard allowing for data exchange between transit business systems, subsystems, components, and devices. It covers C2C, agency-to-public, agency-to-infrastructure, and system-to-system communications. The benefits extend beyond vehicles, operations, and passenger information to business systems and subsystems noted above.
GTFS defines a common format for public transportation schedules and associated geographic information. GTFS "feeds" let public transit agencies publish their transit data and developers write applications that consume the data in an interoperable way. The initial and main benefit of this standard included a free online trip planner available to the public to look up transit information and plan transit trips.
GTFS-ride is an open, fixed-route transit ridership data standard developed through a partnership between the Oregon Department of Transportation and Oregon State University. It allows for improved ridership data collection, storing, sharing, reporting, and analysis.