As nobody has linked to it yet;

        https://en.wikipedia.org/wiki/SPUI

Steve

On Sep 15, 2013, at 6:23 PM, Greg Morgan <[email protected]> wrote:

> 
> Thanks for the help in the Phoenix area.  I've puzzle on how to map these 
> interchanges.  Here's some other examples just down the road from your 
> example.  This example is of how the SPUI is typically mapped but seems 
> lacking http://www.openstreetmap.org/#map=19/33.65519/-112.00010.  Here's one 
> of my attempts with a focus on traffic light placement
> http://www.openstreetmap.org/#map=18/33.67301/-111.97759.  The lights hang 
> off the freeway bridge put I placed them at the stop lines on the pavement.  
> The additional junction and routing relations are a nice plus in your example.
> 
> Note that we have had one mapper in the area that removed highway crossings 
> because he thought that they were excessive.  I wonder what he will do with 
> turn restrictions?  I don't know if his feelings are based on the way iD or 
> Potlach displays these types of features.
>  
> Regards,
> Greg
> 
> 
> 
> 
> On Sat, Sep 14, 2013 at 7:52 AM, Martijn van Exel <[email protected]> wrote:
> Hi all,
> 
> Here in Utah, we have a DOT that is really into SPUIs (Single Point
> Urban Interchanges). They are supposed to increase traffic flow in
> high volume freeway to surface interchanges.
> 
> Here's an example:
> http://www.openstreetmap.org/?#map=19/33.62963/-111.89021 (not in
> Utah)
> 
> This is one I (re)mapped yesterday. I try to stay close to the
> situation on the ground, the result being a lot of turn restrictions.
> I have also seen situations where all the ramps and connectors come
> together at the center, easier to map I guess.
> 
> I am looking for opinions on how to map these complex interchanges.
> Could a few of you have a look at what I did and comment? Thanks.
> 
> --
> Martijn van Exel
> http://oegeo.wordpress.com/
> http://openstreetmap.us/
> 
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