[OSM-talk] Non-junctioning crossing roads

[David Groom]

Yes there should be a node at the crossing.

Most of those ways are one way , so routing software would not allow many  turns anyway.  The only turn I could see being currently as valid would be when going south on Lakeside Drive and turning right onto the northbound carriageway.  To stop this you need a turn restriction relation.

http://wiki.openstreetmap.org/wiki/Relation:restriction

Basically with Lakeside drive having role "From", the junction node having a role "via", and the Northbound carriage way having a role "to"

David


 
  ----- Original Message ----- 
  From: Steve Bennett 
  To: Open Street Map mailing list 
  Sent: Tuesday, December 01, 2009 1:14 PM
  Subject: [OSM-talk] Non-junctioning crossing roads


  Hi all,
    Is it ever correct for two roads to cross physically, at the same level, but not create a junction between them?

  The situation I have looks like:

                    C
           |
  A-->-----+----->--B
           |
           v
           |
           D

  With apologies for ASCII art. Cars go from A to B, or from C to D, but they can't turn. It's controlled by traffic lights. So, do I create the junction represented by the +, or just let them cross over? If I create the junction, how do I stop routing software trying to make turns?

  It's here if want to see it (Nearmap imagery):
  http://www.openstreetmap.org/edit?lat=-37.85348&lon=144.979389&zoom=20

  Queens Rd southbound branches to become Lakeside Drive, crosses Queens Rd Northbound. 

  Sorry for the noob question, just wanted to make sure I get this right.

  Steve



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