[OSM-talk] Divided/Non-Divided Intersection

[Maarten Deen]

On Sun, 11 Jul 2010 22:03:02 -0700, Alan Mintz
<Alan_Mintz+OSM at Earthlink.Net> wrote:
> At 2010-07-10 18:39, John Smith wrote:
>>On 11 July 2010 06:43, Chris Dombroski <cdombroski+osm at icanttype.org> wrote:
>> > I ask because I think this is the cause of stupid GPS directions at times
>> > "make a left, followed by a slight right"
>>
>>Isn't that a problem with the routing software, not the data?
> 
> That's what I would think. The problem may be even worse when ways
> need to be split to accommodate turn restrictions, if the intersection
> is modeled as four separate points.
> 
> I like bringing everything together to a single intersection point
> because that's what it (topo)logically is - a single intersection
> controlled by a group of signals operating together (or stop signs
> with drivers co-operating).

I disagree with that view. A map is a representation of how it looks on
the ground, not how the road is topologically made up.

Or are you also removing bends and curves in roads because they have no
topological meaning?

The first example Nathan gave is IMHO a perfect example how not to map.

Regards,
Maarten