Carlos Dávila wrote:

> The only difference between the wrong and the right routes is the
> --check-roundabouts option passed to mkgmap.

You have to tell mkgmap wether your country is left-hand-drive or
right-hand-drive. If you don't the direction of the first roundabout it
encounters sets this. So if the first roundabout in your OSM file is the
wrong way round all will fail.

>From the documentation:

--drive-on-left
--drive-on-right
        Explicitly specify which side of the road vehicles are
        expected to drive on. If neither of these options are
        specified, it is assumed that vehicles drive on the right
        unless --check-roundabouts is specified and the first
        roundabout processed is clockwise.
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