Fix decreasing_shape_distance in GTFS

Diagnosis

What this notice means

A later shape point has a smaller shape_dist_traveled value than the previous point.

Operational effect

Apps cannot reliably use these distances to place stops along the route line.

Scope

Report field	Type	Meaning
This notice has no structured context fields.

Repair

1
Sort the reported shape by shape_pt_sequence and inspect both reported rows in shapes.txt.
2
Correct the point order or recalculate cumulative distances from the start of the shape. Keep the units consistent with stop_times.txt.
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