[OSM-talk] How to integrate a roundabout into a relation

Ben Laenen benlaenen at gmail.com
Sat Jan 31 14:27:47 GMT 2009


On Saturday 31 January 2009, Lester Caine wrote:
> Marc Schütz wrote:
> > 4) Split the roundabout as needed, tag all parts as
> > junction=roundabout (don't use a roundabout relation), and add only
> > the needed parts into the route.
>
> 5) Properly define a relation so that it does not need to know every
> single segment, but can 'work it out' from the normal rules. That is
> it only needs to pick up segments from the roundabout that fill in
> the gap on the segments it is following. So going north on a dual
> carriageway, only the north facing segments are traced, along with
> the correctly directed segments in the roundabout.

That stops working in case of walking routes: where the marks are just 
on one side of the roundabout, and where hikers always take the same 
part of the roundabout whatever direction they're walking on that 
route.

Number (4) is the only way everything works.

Ben




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