[mkgmap-dev] Turn restriction angle checks

Tue Apr 1 14:54:14 BST 2014

Hi Marko,

just to make sure: 
The example shows a no_u_turn restriction
where "from" way  and "to" way are equal and a via node is used.

Are that the criteria which should tell mkgmap to emit an info and 
ignore the restriction? 

Why not a warning? I'd say all correct restriction relations which are
ignored should produce a warning.

Gerd

> Date: Tue, 1 Apr 2014 16:10:52 +0300
> From: marko.makela at iki.fi
> To: mkgmap-dev at lists.mkgmap.org.uk
> Subject: Re: [mkgmap-dev] Turn restriction angle checks
> 
> On Sun, Mar 30, 2014 at 02:34:07PM +0200, Gerd Petermann wrote:
> >>BTW, I accidentally loaded a relation somewhere in Russia and 
> >>downloaded the surroundings. There were lots of no_u_turn on every 
> >>crossing of a major road. That kind of micro-mapping does not exist 
> >>over here; I guess that mappers expect people to apply common sense 
> >>and not make a u-turn as soon as the navigator suggests it, no matter 
> >>what.
> 
> I found an example of this in Finland. IMO, these relations should 
> simply be ignored, maybe emitting a NOTE or INFO (not WARNING):
> 
> 2014/04/01 08:03:24 SEVERE (RoadNetwork): 63240002.osm.pbf: Turn 
> restriction http://www.openstreetmap.org/browse/relation/1785864 (at 
> http://www.openstreetmap.org/?mlat=60.224055&mlon=24.995477&zoom=17) 
> check special case from = to arc 
> 
> Normally the navigator should not generate routes where you do a U-turn 
> like this. Even if it did, the driver should know to make the U-turn at 
> the next convenient place where it is both practical and not forbidden.
> 
> 	Marko
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