[Routing] Bad routing: U turns for highway links?

[Anthony]

On Wed, Jul 21, 2010 at 1:38 PM, Stephen Woodbridge <woodbri at swoodbridge.com
> wrote:

> So what rules are you proposing the router should implement again?
>

I'm not proposing anything.  It's not my place to do so.  If I were writing
the router, I'd have a checkbox for "avoid U-turns".


> There is nothing in your above explanation that would lead me to believe
> that this should be in the router.


Fine, don't put it in.  I was mainly just explaining why it shouldn't be in
the data.


> I the data model does not support encoding all these information then that
> should be fixed.


What information?  It's a really sharp turn.  That's already encoded in the
data.  In fact, Cloudmade's router even *says* "make a sharp left".  So the
router already knows it's a really sharp turn.

What more information do you need?


> Things like turn restrictions should be implemented in the data.


Agreed.  But there is no turn restriction at
http://www.openstreetmap.org/?lat=28.077361&lon=-82.570335&zoom=18&layers=B000FTF

There's no sign saying "no left turn".  There's no barrier.  There's no
painted median.  There's nothing to map.
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