> Date: Sun, 23 Mar 2014 12:12:36 +0200
> From: marko.makela@iki.fi
> To: mkgmap-dev@lists.mkgmap.org.uk
> Subject: Re: [mkgmap-dev] Turn restrictions with role=via ways
>
> On Sun, Mar 23, 2014 at 09:52:53AM +0100, Gerd Petermann wrote:
> >I am not sure how I should interpret a restriction relation with
> >restriction=only_* and a via way.  AFAIK the Garmin format doesn't have
> >such kind of restriction, so we have to translate it into one or more
> >no_* restrictions for the other possible ways. This was rather easy for
> >restrictions with a via node, but how should I do it for via ways?
> >Examples:
> >http://www.openstreetmap.org/relation/67571
>
> This looks like a mapping error (should simply use a 'via' node).
>
> >http://www.openstreetmap.org/relation/1745548
>
> This one is more tricky.
>
> The note on the relation says that there is a lane marking that you
> cannot cross when turning right from the parking lot. So, you can only
> continue straight to Mäkelänkatu and not take an immediate left turn to
> Vääksyntie.
>
> It seems that also this one could be corrected in the map data by
> branching the Vääksyntie exit before the parking lot driveway. In that
> case, there would be no need for a turn restriction.
>
> The real trouble (AFAICT) is no_u_turn with role=via ways. That cannot
> be fixed by manually simplifying the map data.
>
> Marko
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