[OSM-talk] traffic signals at dual-carriageway and complicated intersections

[Lachlan Rogers]

I really like this suggestion.  However, what should be done when two
intersecting roads are dual-carriageway and different highway types.  In
this case the middle square of the intersection would have two sides of a
particular type and the other two sides a different type.

Of course, it is possible to have multiple ways over the same segments, and
this would be the solution.  Was this what you had in mind?

On 7/31/07, Brent Easton <b.easton at exemail.com.au> wrote:
>
>
> I think it has been mentioned before, but I think the only real answer is
> that the middle square of the intersection becomes it's own way with a
> 'junction=traffic_lights' tag.
>
> The renderers can than display just one symbol at the c.o.g. of the
> junction way. This reflects the reality that there is only one junction with
> one 'set' of lights, not 4 seperate junctions, each with their own set of
> lights.
>
> This also works where a divided road is crossed by a single way, the short
> line connecting the two ways would be created as it's own way with
> 'junction=traffic_signals'.
>
> Brent.
>
>
>
> *********** REPLY SEPARATOR  ***********
>
> On 31/07/2007 at 10:41 AM Lachlan Rogers  wrote:
>
> >I've been wondering about the best way to map complicated intersections
> >with
> >traffic signals. A common example of where my dilemma arises is when
> there
> >are traffic signals at any intersection involving a dual-carriageway
> road.
> >
> >I've been tagging each node involved in the intersecting ways, since this
> >seems the best method for providing route-planners with accurate
> >information.  However, the rendering typically involves overlapping
> >symbols,
> >as can be seen here:
> >
> http://informationfreeway.org/index.php?lat=-35.27578979216632&lon=149.12939396721774&zoom=17&layers=B000F000
> >
> >The other aspect of this that has bothered me is that navigation systems
> >would probably see duplicate sets of lights and give incorrect
> instructions
> >such as "turn left after the next two sets of lights" when it is really
> >referring to a single intersection.
> >
> >In another thread recently, Cameron Patrick mentioned
> >
> >> In my experimental maps of Australia, I've used a transparent orange
> >> circle on the intersection.  Look along e.g. Stirling Highway in the
> >> middle of this map:
> >>
> >
> http://osm.largestprime.net/map/?lat=-3738202.21988&lon=12890789.70953&zoom=15&layers=B0
> >
> >> What are people doing for traffic lights on junctions of dual
> >> carriageways?  I've been placing a node in the middle of the
> >> intersection, not sitting on any of ways involved, which renders nicely
> >> but lacks semantic information for route planners.
> >
> >I like the way his traffic signal intersections are rendered, but I think
> >we
> >do need a solution that caters for route planners and navigation devices.
> >
> >What is the best solution?
> >
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> ____________________________________________________________
> Brent Easton
> Analyst/Programmer
> University of Western Sydney
> Email: b.easton at uws.edu.au
>
>
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