[OSM-talk] Divided/Non-Divided Intersection

Maarten Deen mdeen at xs4all.nl
Sun Jul 11 09:23:03 BST 2010


John Smith wrote:
> On 11 July 2010 06:43, Chris Dombroski <cdombroski+osm at icanttype.org> wrote:
>> I ask because I think this is the cause of stupid GPS directions at times
>> "make a left, followed by a slight right"
> 
> Isn't that a problem with the routing software, not the data?

Not IMHO.

If you have a layout like this (use a fixed-width font):

      | |
A----+-+
      | +----B
C----+-+
      | |

And you want to go from B to A, why would routing software say "go straight on" 
and not "go right, then go left"?

And option is to map it like this:
      | |
A----+ |
      |\|
      | +----B
      |/|
C----+ |
      | |

Maarten




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