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

Tue Mar 18 08:07:23 GMT 2014

Hi Marko,

I fear restrictions with multiple via ways are too complex, or I did not understand them
If I got that right, we cannot simply convert them to
normal restrictions, as they are somehow describing a list of ways
which is not allowed to be travelled in that order. 
I cannot even think of a trafic sign for that :-(

I am not sure if Garmin has a restriction type that 
allows multiple via points. We found out that it has a
type that has more than 3 points, but I thought that
this is used to list multiple "to" nodes.

@Steve: Could it be that the 05 60 00 type restrictions
have two via points?

Gerd

From: gpetermann_muenchen at hotmail.com
To: mkgmap-dev at lists.mkgmap.org.uk
Date: Mon, 17 Mar 2014 11:02:01 +0100
Subject: Re: [mkgmap-dev] Turn restrictions with role=via ways

Hi Marko,

I'll have a look at it.

Gerd

> Date: Fri, 14 Mar 2014 00:03:43 +0200
> From: marko.makela at iki.fi
> To: mkgmap-dev at lists.mkgmap.org.uk
> Subject: [mkgmap-dev] Turn restrictions with role=via ways
> 
> Now, with all these routing improvements, I wonder if it would be 
> possible to extend our support for turn restrictions.
> 
> Some mapper seems to prefer via ways to via nodes in this crossing:
> 
> http://www.openstreetmap.org/way/30692839
> 
> This 2-node way is a role=via member of a no_u_turn restriction that has 
> 4 ways as members: from,via,via,to. It is also a role=via member of a 
> no_left_turn restriction.
> 
> The no_u_turn restriction could have been mapped with three ways as 
> from,via,to and the no_left_turn could have been mapped with having this 
> way as role=from, and a node as role=via. Even if I changed the map like 
> that, mkgmap would still ignore the no_u_turn, because the role=via 
> member would be a way.
> 
> So, I wonder if we could start supporting this style of mapping? There 
> are lots of dual carriageways in city areas where such turn restrictions 
> are common, at least for no_u_turn.
> 
> 	Marko
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> mkgmap-dev mailing list
> mkgmap-dev at lists.mkgmap.org.uk
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