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[mkgmap-dev] Turn restrictions with role=via ways

From Gerd Petermann gpetermann_muenchen at hotmail.com on Sun Mar 23 10:16:51 GMT 2014

Hi Marko,

I don't care whether the restrictions could be changed in OSM. I just
want to make sure that I translate them correctly we writing the img file.


> Date: Sun, 23 Mar 2014 12:12:36 +0200
> From: marko.makela at iki.fi
> To: mkgmap-dev at 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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