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That would be Norsholmen right before Stockholm, but there is a small town Norsholm between Linköping and Norrköping that the author put in the image in the article.

Here is a non-paywall version of the same event that says "4 mil" (40km): https://nyheter24.se/motor/1273809-tesla-forare-sov-pa-e4-me...