[OSM-talk] routing - US interstate type junction -Wichita, KS

[Richard Weait]

On Tue, Sep 22, 2009 at 5:04 PM, Tim Litwiller <tim at litwiller.net> wrote:
> There is a junction on the north end of Wichita KS, that does not route
> correctly in the southbound direction.
>
> http://www.openstreetmap.org/?lat=37.7627&lon=-97.3218&zoom=14&layers=B000FTF
>
> I downloaded the openstreetmap for Garmin from na1400.info and noticed
> it there so I tried the same navigation from
> http://www.yournavigation.org/ and it did the same thing. I added
> bridges to this intersections map a few days ago - but the na1400.info
> data doesn't have my changes yet. I have looked at the tags on the
> sections of the road and don't see anything unusual.
>
> cloudmade.com seems to have an older version of the data and on there
> the routing works.
>
> I would like to fix this and if I messed it up I apologize and want to
> learn from this so it doesn't happen again.
> If someone has time to find the problem - please let me know what it is.


where 254 W ramp merges into 81 S, there was an errant node that
required a 178 degree turn left, then 178 degree turn right after a
few yards.  This was bad for my neck at 70 MPH, so I removed it.  ;-)
http://www.openstreetmap.org/browse/node/505128415/history

That sort of thing happens to me when I edit with potlatch and fumble
the mouse.  Not an analogy.

If you are fixing TIGER stuff, remove the tiger:reviewed=no tags, or
change them to yes.

I consider layer=0 redundant and leave it out.  Others don't.  ;-)

Interstates, US Routes, State Routes, anything with a highway shield
sign, should have a ref=number, so I-254 is ref=254

TIGER had nodes that joined each overpass to each road passing below.
Detach those nodes, then delete them.  If they add important shape,
move them enough that they don't overlap.

None of this should break routing.though.

There are a couple of typos lay=0

Do you ever change from a layer to a layer more than +/-1?  I wonder
if that will break routing?

Have fun!