[mkgmap-dev] r3174 in via_ways branch

Wed Apr 9 12:18:10 BST 2014

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