Well up to 3 duplicates (plus original) way there is never a problem. 4 duplicates can be problematic, 5 duplicates IS in 90% of cases problematic. I think I will rewrite my style to have maximum two duplicates, but usually no more than 1. Any solution to get rid of duplicates completely if 5 or more would be nice - but it seems Gerd cannot find a solution so be it. And yes it's not always a bug is OSM data (especially with areas) - but mostly (95% of the cases I analyzed) it was.

On 29 March 2018 at 16:12, Andrzej Popowski <popej@poczta.onet.pl> wrote:
Hi Gerd,

I haven't followed this discussion, sorry if I repeat a case or problem is already dealt with.

When you use highways defined as area for routing, then area border is converted to road. Quite often there are multiple areas with common border. This common border can lead to duplicate reads. Data in OSM is correct and there is nothing to report, but it would be good if mkgmap could remove duplicate.

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Best regards,
Andrzej

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