[Tagging] How to tag: Legally separated ways

Colin Smale colin.smale at xs4all.nl
Mon Oct 15 09:13:06 GMT 2012

I would choose option b).

Even if all four lanes are one piece of carriageway, it is useful for 
routing directions etc to be able to make a distinction between the left 
and right parts of the road. Normal mortals are supposed to treat the 
solid white lines as if they were a brick wall anyway, and be on the 
correct part of the road before part 5 starts. If we start tagging 
exceptions to traffic laws for emergency vehicles then we have an awful 
lot of work to do...

I am not sure I would interpret the diagram in that way though; the fact 
that there are no arrows on the road from part 5 onwards suggests to me 
that there is no chance of changing your mind. I think the intention is 
that part 5 is the start of physical separation, but I might be wrong here.


On 15/10/2012 10:56, Martin Vonwald wrote:
> Hi!
> Some kind of short how-would-you-tag-this-survey. Have a look at part
> five of this motorway:
> http://wiki.openstreetmap.org/wiki/File:Lanes_Example_2.png
> Only part 5 is relevant. Assume there is no physical separation just a
> double line between the upper and lower two lanes. How would you tag
> this:
> a) One way with lanes=4
> b) Two separate ways with lanes=2 each
> c) Tell me!
> Please also reason your decision.
> Many thanks in advance,
> Martin
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