I sure hope I am replying correctly to your reply! To clarify two points: Yes, the JOSM "validator" detected the duplicate Ways, both pipelines, highways and buildings which is how I discovered the issue. Unfortunately, when you "upload", you can be overwhelmed by the shear number of "errors". And, a weird thing I noticed was the duplicate Ways were "glued" together which complicated detecting and correcting these errors. Are the duplicate Ways you have discovered "glued" together because many "mappers" probably wouldn't try "unglueing" when trying to identifying/correcting such errors? Good luck trying to identify the cause of your "duplicates", Harrison S
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