[Tagging] How to tag: Legally separated ways

Kytömaa Lauri lauri.kytomaa at aalto.fi
Wed Oct 17 07:28:09 GMT 2012

>Only part 5 is relevant. 
Having just returned from my (mapping) trip, and having finally 
browsed through all these messages on this subjet, I don't think 
anybody mentioned it explicitly: You can't consider only part 5. 
At part 6, the ways are physically separated, so IMO there 
should be two separate nodes on the 5 - 6 border. With two 
nodes there, the transition from one way (part 4) two two ways
happens during part 5. Often, but not always, before the 
physical separation begins, the solid line is of convenient length
for said transition. 

>Assume there is no physical separation just a
>double line between the upper and lower two lanes. How would you tag
>a) One way with lanes=4
>b) Two separate ways with lanes=2 each
>c) Tell me!

Depending on the length of part 5, fully b, or if it's a really long 
part, first as one way, and as two ways from the point where one
or both of those ways' angles match the angles of the ways in 
part 6. Where I'd draft the definition of "match" as "equals, or 
makes a bit shallower or a bit steeper angle with the orientation 
of the part 5 carriageway"; this is to say "no abrupt right-left-curves,
but don't do separate ways at the start of a long decelaration lane 


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