[Talk-us] US Interstate ways alignment

Richard Weait richard at weait.com
Wed Jun 17 22:41:55 BST 2009

On Wed, 2009-06-17 at 15:23 -0500, Stephen Johnson wrote:
> Some of the TIGER ways and nodes for Interstates in my area are way
> out of alignment. They are all over the map if you'll forgive the pun.
> I have several GPS tracks for most of the Interstate lanes. 
> My question is what should I align the ways to? The center, inner or
> outside lanes? Is there some consensus for it which I have't found
> yet?

I'll echo Adam and Chris and say "align to the center of the driving
width".  Given one GPS track, it's easy to know where to put the line.
Given more than one, plus aerial imagery, you might never be sure.  ;-)
Use your judgement.  

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