[Talk-us] US Interstate ways alignment

[Chris Lawrence]

On Wed, Jun 17, 2009 at 3:23 PM, Stephen Johnson<sjohnson at monsters.org> 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?

Ideally, the center of the carriageway (the middle of the paved area).
 In practice, on a 2-lane Interstate the right lane is essentially in
the middle once you factor in the shoulder, while on 3+ lane highways
it will be around the middle lane (where modern standards call for
equal shoulders on both sides of the carriageway).


Chris