[OSM-talk] [Tagging] - RFC - Motorway_linkimpliesoneway=??

Ed Loach ed at loach.me.uk
Tue Oct 7 11:38:35 BST 2008


Dermot wrote:

> So we can solve this problem right now by deciding that a
> better list
> of implied-one-way highway ways is:
> 
> those with junction=roundabout

Funnily enough we were discussing roundabouts on a non-OSM related
list yesterday, and I looked up Greenstead Roundabout in Colchester

http://www.openstreetmap.org/?lat=51.88448&lon=0.93284&zoom=17&layer
s=0B00FFF

This is a roundabout where you can go either way around the "big"
roundabout, and at each junction with a road there is a
mini-roundabout. When these sort of roundabouts, often nicknamed
"Magic Roundabouts"
http://en.wikipedia.org/wiki/Magic_Roundabout_(Hemel_Hempstead)
cropped up on this other email list I wondered how they were tagged
in OSM, because of the implied oneway of junction=roundabout.

In the Colchester example it is a circular primary route with 5
mini-roundabouts at the junctions. I wonder whether 
  junction=roundabout
  oneway=no
would have had the same results? Or would renderers think to check
for oneway=no on roundabouts?

Ed






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