Hello,

On a regular basis I have to write to some contributors that use automatic methods to merge nodes in the US so I though I would copy my message here so everyone is aware:

Please do not run automatic merge tools in the US. Doing this you will connect entities that should not (e.g. river with road). This is due to the source of the imports that have duplicate nodes for different type of entities. If you want to fix duplicates in the US you need to review your changes one by one.

Also to avoid such mistakes you can use the JOSM validator plugin that sorts duplicates by type of ways i.e. highway duplicates, boundary duplicates, waterway duplicates, powerline duplicates, ....

 Thanks in advance,

N.

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