APTA-TCIP is a communications interface standard that facilitates the exchange of data among systems used in transit applications.
TransXChange is the UK nationwide standard for exchanging bus schedules and related data.
Transmodel is a transit reference data model developed by the European Union.
RIITS - Stands for Regional Integration of Intelligent Transportation System. The network supports information exchange in real-time between freeway, traffic, transit and emergency service agencies to improve management of the Los Angeles County transportation system and better serve the traveling public.
Standards:
Geospatial One Stop (GOS) - Briefing on the Geographic Information Framework Data Content Standard given at the AASHTO GIS-T Conference. The slides on the transit model (Part 7d) are outdated and will be updated at a later time.