[mkgmap-dev] r3174 in via_ways branch

Wed Apr 9 13:59:01 BST 2014

Hi Marko,

okay, if I hear no complains I'll merge it tomorrow.

Gerd

> Date: Wed, 9 Apr 2014 14:18:10 +0300
> From: marko.makela at iki.fi
> To: mkgmap-dev at lists.mkgmap.org.uk
> Subject: Re: [mkgmap-dev] r3174 in via_ways branch
> 
> On Tue, Apr 08, 2014 at 08:46:34AM +0200, Gerd Petermann wrote:
> >I think the branch is ready for trunk now.
> 
> Me too. While I did not test routing, it seems that you did that on 
> behalf for me (in Finland). I checked the warning messages, and I think 
> that they all are clear and warranted now.
> 
> >I did a few more tests regarding turn restrictions with via ways.  It 
> >seems that they are working, but the effect is minimal. In Finland, 
> >they  are (now) used only in no_u_turn restrictions, and the Garmin 
> >algo seems to avoid these u-turns anyway if alternatives are available.
> 
> I guess that the impact is bigger in places like California, where they 
> have dual oneways and they only allow left-turns and U-turns in certain 
> intersections. Then it is common that you will have to drive slightly 
> past your destination, make a U-turn a few intersections later, and then 
> make a right-turn.
> 
> I have not checked the mapping detail in those areas. If these 
> dual-oneways are already mapped as such in OSM (instead of being mapped 
> as one two-way street), no turn restrictions would be needed.
> 
> 	Marko
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