[Talk-us] Use of ref-tag on state highways

[Henk Hoff]

For every rule we can find exceptions. 

The basic idea behind the decision-tree was: use the most important / most logical route for the way-ref tag. Putting every single route-label in the ref-tag is not a good idea. 

If you want to identify a whole route, use a relation. Based on the relations (a way is part of) a routing engine could then identify under which other route numbers this road is also known by.



Op 21 aug. 2011, om 16:35 heeft Alan Mintz het volgende geschreven:

> At 2011-08-21 06:56, Henk Hoff wrote:
>> A suggestion:
>> - ... When the road is part of multiple routes, the main route is used. That could be:
>> ** a higher classification prevails  (US over state)
>> ** the continuous route prevails (if route x uses part of route y to get to it's next section, then route y is used).
>> ** the number closed to 0 prevails
> 
> I disagree. The semi-colon delimiter should be used. I doubt people could remember which rule to apply, and I don't agree it should be applied anyway, as for any particular roadway, the name by which it is colloquially known is inconsistent. CA example:
> 
> I-215 shares routing with SR-60 for a few miles. People in the area still consider it SR-60. It is tagged ref="CA 60;I 215".
> 
> SR-79 shares routing with I-15 for a few miles. People in the area still consider it I-15. It is tagged ref="I 15;CA 79".
> 
> These actually conform with the second rule above (and the third, but that's entirely coincidental), but I'm sure I can find counter-examples.
> 
> --
> Alan Mintz <Alan_Mintz+OSM at Earthlink.net>
> 
> 
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