Proposal: exact_times

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Brian Ferris

읽지 않음,
2011. 8. 30. 오전 7:54:5011. 8. 30.
Original Discussion:

Summary of proposal:

The addition to the frequencies.txt section of the GTFS spec:

exact_times (optional):
The exact_times field determines if frequency-based trips should be
exactly scheduled based on the specified headway information. Valid
values for this field are:
“0” or (empty) - Frequency-based trips are not exactly scheduled.
This is the default behavior.
“1” - Frequency-based trips are exactly scheduled. For a
frequencies.txt row, trips are scheduled starting with trip start time
= start_time + x * headway_secs for all x in (0, 1, 2, ...) where trip
start time < end_time.

The value of exact_times must be the same for all frequencies.txt rows
with the same trip_id. If exact_times is 1 and a frequencies.txt row
has a start_time equal to end_time, no trip must be scheduled. When
exact_times is 1, care must be taken to choose an end_time value that
is greater than the last desired trip start time but less than the
last desired trip start time + headway_secs.

Initial implementation from a GTFS producer and consumer:

Producers: Over 6% of the feeds in the current Google Transit corpus
define an exact_times field.
Consumers: The field is validated in the googletransit extension of
the feed validator and used in the Google Transit product.
Status: Prime candidate for acceptance.

Unless there are objections in the next week (Sept 6), we will
formally add this proposal to the GTFS spec.


Brian Ferris

읽지 않음,
2011. 9. 6. 오전 2:49:3411. 9. 6.
Seeing no objections, I'm making this one official.


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