[OSM-newbies] Adding a cul-de-sac to an existing street

[John F. Eldredge]

On 08/19/2010 08:23 PM, Steve Bennett wrote:
> On Fri, Aug 20, 2010 at 10:51 AM, Richard Weait <richard at weait.com> wrote:
>   
>> OSM expects a 'way' to be either a line, or a simple, closed polygon.
>> Self-crossings, bifurcations and self-intersections other than a
>> simple closed polygon are errors.
>>     
> Interesting, I didn't know that. Potlatch behaves badly when dealing
> with self-intersections (ie, a P shape) but I didn't realise that it
> wasn't supported in OSM in general.
>
> Steve
>
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>   
When I mapped the Mill Creek Greenway (see
<http://www.openstreetmap.org/?lat=36.0607659816742&lon=-86.6719150543213&zoom=15>,
it was not a closed polygon, but Potlatch didn't report any errors, and
no one has "corrected" (i.e., removed) it.