[OSM-talk] traffic signals at dual-carriageway and complicated intersections
lachlan at rogers.name
Wed Aug 1 04:19:32 BST 2007
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
> 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
> *********** 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
> >traffic signals. A common example of where my dilemma arises is when
> >are traffic signals at any intersection involving a dual-carriageway
> >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
> >as can be seen here:
> >The other aspect of this that has bothered me is that navigation systems
> >would probably see duplicate sets of lights and give incorrect
> >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:
> >> 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
> >do need a solution that caters for route planners and navigation devices.
> >What is the best solution?
> >talk mailing list
> >talk at openstreetmap.org
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> 30/07/2007 5:02 PM
> Brent Easton
> University of Western Sydney
> Email: b.easton at uws.edu.au
> talk mailing list
> talk at openstreetmap.org
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