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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