On Wed, Jun 24, 2009 at 10:08 AM, Alan Millar <[email protected]> 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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