[Tagging] lanes tag dispute

John F. Eldredge john at jfeldredge.com
Sun Sep 18 19:12:16 BST 2011


Anthony <osm at inbox.org> wrote:

> On Sun, Sep 18, 2011 at 1:34 PM, Anthony <osm at inbox.org> wrote:
> > On Sun, Sep 18, 2011 at 1:21 PM, Nathan Edgars II
> <neroute2 at gmail.com> wrote:
> >> It's simple on a motorway. But, for a simple example on a surface
> road, how
> >> do you know where the straight lanes go if there are 3 lanes after
> an
> >> intersection but 2 before?
> >
> > Depends on what data you have.  If you have lane width information,
> > then it's easy to figure this out.  If you don't, then you can't
> > figure this out.
> 
> Nevermind.  Yes you can.  If the center of the 3 lane road is to the
> left of the center of the 2 lane road, then the lane was added on the
> left.  If the center of the 3 lane road is to the right of the center
> of the 2 lane road, then the lane was added on the right.
> 
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There are a few cases here in Nashville, TN, USA, where the through lanes on one side of an intersection don't line up precisely with the through lanes on the other side.  Generally, this is because of the later addition of a central turn lane.  As a result, the intersection includes diagonal dotted markings showing where the through traffic is supposed to go.

-- 
John F. Eldredge -- john at jfeldredge.com
"Reserve your right to think, for even to think wrongly is better than not to think at all." -- Hypatia of Alexandria




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