Fix decreasing_or_equal_stop_time_distance in GTFS

Diagnosis

What this notice means

Within a trip, shape_dist_traveled stays the same or decreases as stop_sequence increases.

Operational effect

The distances can place stops on the wrong part of the trip's shape, especially on loops.

Scope

Report field	Type	Meaning
`csvRowNumber`	integer	The row number from `stop_times.txt`.
`prevCsvRowNumber`	integer	The row number from `stop_times.txt` of the previous stop time.
`prevShapeDistTraveled`	object	Actual distance traveled along the shape from the first shape point to the previous stop time.
`prevStopSequence`	integer	The previous record's `stop_times.stop_sequence`.
`shapeDistTraveled`	object	Actual distance traveled along the shape from the first shape point to the faulty record.
`stopId`	string	The id of the faulty stop.
`stopSequence`	integer	The faulty record's `stop_times.stop_sequence`.
`tripId`	string	The id of the faulty trip.

Repair

1
Compare the reported row with prevCsvRowNumber in stop_times.txt and check the actual stop order.
2
Recalculate cumulative distances along the correct shape, using the same units as shapes.txt. Preserve enough precision for consecutive values to increase; do not invent increments.
3
Check the result
After a repair, rebuild the archive and validate it again. Confirm that the affected records are correct and that no new related notices appeared. A reviewed warning or informational notice may remain when it describes intentional, supported data.

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Sources