> > Routing is completely broken if you change the source so that merging is
> > also
> > done for roads in res 24, so it must be handled with care,
>
> The LineMergeFilter does not care about routing nodes. That should be
> the reason why routing fails when using it at res 24.

yes, but not the only one. I created a version that made sure to split
roads so that they start and end with coordNode, but that (alone) did not
help.

> Anyhow I did not yet fully understand about the relation of the routing
> network (NOD) to the map data at resolution 24. Are there any ids that
> are shared? When selecting a street how does the Garmin find the correct
> entry into the routing network?

I wish I could say that I understand it :-O

>
> > but we may also
> > allow it again
> > for res < 24.
>
> Unless there is a concrete example or a concrete explanation why it
> shouldn't be allowed I would allow it.
yes, I agree.