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I'm guessing OSM is only used for routing not for actual navigation and that they filter out clear vandalism using edit criterias and ingestion delays.

I read a Facebook blog post a few weeks back about how they integrate OSM updates. I forget all of it but they use satellite images and CV to detect if a road exists, as well as some other automated tests. I think they open-sourced it, although I can't seem to find the post now

they didn't open source the code that produces those road suggestions, but they have released the data output

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