On 4/10/2012 7:46 AM, Peter Dobratz wrote:
I'm experimenting with the Java code from Traveling Salesman
http://wiki.openstreetmap.org/wiki/Traveling_salesman
I'm making library calls to the routing code and it seems that the
router does not understand cul-de-sacs mapped as a single
self-intersecting way. This got me thinking about different ways to
possibly map cul-de-sacs. I generally use Way with
highway=residential or highway=unclassified. At the end of the road
there is a loop that intersects the same Way. Here is one that I
recently mapped:
http://www.openstreetmap.org/browse/way/158307363
Is this how people generally map these things?
No, I ususally tag the end node highway=turning_circle. There are so
many of them littered around US suburbia that mapping each and every one
of them as a circular way would make for a lot of not too useful data,
not to mention a lot of work.
One other possibility that I could think of was splitting the circular
part at the end and tagging it junction=roundabout. However, this
would imply that the road is one-way, and I'm not sure that that is
the case. Typically there is no one way sign on the ground and people
feel free to travel in either direction on these (though being a
cul-de-sac they don't have a lot of traffic).
A roundabout (or mini_roundabout) implies to me (although it is not
defined on the wiki) that there is more than one entry / exit road. So
intuitively I'd say that is not an appropriate tag.
--
Martijn van Exel
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