[Talk-us] Fixing Alignments in JOSM

[Karl Newman]

On Wed, Jun 24, 2009 at 10:08 AM, Alan Millar <am12 at bolis.com> wrote:

> > However in reality it is a staggered junction.
> >
> > So I need to split the North-South way into two pieces and it intersects
> > the East-West way in two places.
>
> Depending on how far off the stagger is, you also may want to consider not
> splitting it, but just aligning the streets with two extra nodes.  I've
> come across this where the stagger is small, and feels like it can still
> be considered one intersection.
>
> Here's an example of several intersections like that within a few blocks
> of each other:
>
>
> http://www.openstreetmap.org/?lat=45.56144&lon=-122.65675&zoom=17&layers=0B00FTF
>
> Your taste may vary; it's just an alternative suggestion.
>
> - Alan
>

+1 for that method, because it follows how you'd actually drive it. You're
not turning onto the cross street, and then turning again to follow the
original road; you're just angling a bit. Splitting it into neat
perpendiculars may look nice to align it with the aerial imagery, but it's
likely to confuse some less-sophisticated routing engines. This could result
in a detour and delay for the driver if the routing engine told the driver
to turn onto the cross street and he or she gets into a dedicated turn lane,
and then realizes too late that they should have gone straight instead.

Karl
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