Support for frequency-based GTFS-realtime TripUpdates feeds?

[Barbeau, Sean]

Hi all,

Has anyone tried using GTFS-realtime TripUpdates for frequency-based (exact_times=0) trips with OneBusAway?

 

We're interested in setting up TheTransitClock to take real-time vehicle positions from our campus shuttle system (USF Bull Runner) and generate a GTFS-rt TripUpdates feed compatible with OneBusAway so we can add it to the OneBusAway Tampa region (http://tampa.onebusaway.org/).

 

Here's our data:

• GTFS - https://github.com/CUTR-at-USF/bullrunner-gtfs-realtime-generator/raw/master/bullrunner-gtfs.zip
• GTFS-rt VehiclePositions - http://maps.usf.edu:8088/vehicle-positions (debug version in plain text is at http://maps.usf.edu:8088/vehicle-positions?debug)

Assuming TheTransitClock can generate this info, we need to know if OneBusAway properly handles frequency-based real-time updates or if that needs further work.

 

Note that "frequency-based" here means that the vehicle isn't scheduled at an exact time - instead, riders are told that vehicles will arrive approximately every X minutes (this is defined as exact_times=0 in GTFS frequencies.txt https://developers.google.com/transit/gtfs/reference/#frequenciestxt).  This means that the expectation of the next arriving vehicle changes based on every arriving vehicle - if a vehicle just arrived, a rider would expect the next one to arrive in X minutes.  Real-time information (GTFS-rt TripUpdates) reduces this window to an exact predicted arrival time.

 

A related question on TheTransitClock group for generating frequency-based GTFS-rt Trip Updates:

https://groups.google.com/forum/?hl=en#!topic/thetransitclock/gFsv_akNmCs

 

Thanks,

Sean

 

Sean Barbeau, Ph.D.

Center for Urban Transportation Research

University of South Florida

 

[Sheldon A. Brown]

My memory is mirky here -- but didn't we successfully test the
bullrunner with such a scenario, or was exact_times=1 in that case?

Otherwise, I know of no instances of the above -- so I eagerly await
anyone else jumping in here...

Sheldon

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