[mkgmap-dev] [PATCH] turn restrictions - alpha code for testing

Tue Feb 24 16:57:07 GMT 2009

Nice one. I had a chance to try this today and I was no longer
instructed to turn right at places where it's a no_right_turn so in my
admittedly limited testing this works well.

I also ran this against the great_britain.osm file and had no problems
other than the obvious large number of incorrect restrictions in the raw
data

Paul

Mark Burton wrote:
> Folks,
> 
> The attached patch implements the OSM turn restriction relation as described in
> 
>  http://wiki.openstreetmap.org/wiki/Relation:restriction
> 
> Here's an example that shows multiple relations being used at a junction
> 
>  http://www.openstreetmap.org/?lat=50.26386&lon=10.96498&zoom=17
> 
> JOSM shows little restriction signs but I think a lot of renderers won't
> show anything.
> 
> Only "well formed" turn restrictions are handled - i.e. the 'from' and 'to'
> ways must terminate at the 'via' node.
> 
> Badly formed turn restrictions will yield a (hopefully) useful error
> message that includes the OSM id so that you can go find the relation
> using JOSM, etc and fix it.
> 
> Multiple 'via' members or the 'via' member being a way rather than a node are
> not handled. Those variants are not forbidden by the above description but
> not encouraged either and I don't, at this time, think there's good reason
> to handle them - if you believe otherwise and can present a compelling case
> for their inclusion, I will add support for them.
> 
> The "except", "day_on/off", "hour_on/off" tags are ignored. I don't
> know how to express those constraints in garmin-speak.
> 
> The --ignore-turn-restrictions option can be used to disable the feature.
> 
> Please test and report success/failure, etc.
> 
> Cheers,
> 
> Mark
> 
> 
> 
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