For all the Seattle-area agencies that power the OneBusAway API, we
get real-time arrival information from data feeds from the agencies
themselves. Typically, agencies have installed GPS equipment on their
buses that reports back to a central server over a radio or cellular
network. The exact technology used can vary depending on the needs of
the agency and the CAD-AVL vendor they select (or build on their own,
as is the case with the NYC MTA and the
http://bustime.mta.info/project).
Thanks,
Brian
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