[OSM-talk] colour fills in osmarender

[TM]

Raphaël Jacquot wrote:
> Etienne wrote:
>   
>> Are loops and branches in ways a good thing or a bad thing?   I can
>> imagine that route planning applications might find them problematic,
>>     
>
> I believe we shouldn't have loops of any sort.
> routing algorithms like to have straight simple topologies. loops add a
> huge level of complexity that I don't think is necessary
>
>   
It seems that roads (ways, that is) containing loops (like roundabouts)
would complicate things. One option would then be to turn the loops
(roundabouts) themselves into ways, separate from the roads which they
connect. This would lead to instructions like "drive road A to the X
roundabout (x km), take road A to road B (y km)..." The downside is that
our ways are actually split into several parts -- which I guess we could
call segments... :-)

But what if roundabouts were defined (or treated by the routing
algorithm) as points, albeit of a special kind? Would this make sense?
(If they were regular points, displaying the data  would mean
visualising the data structure rather than describing actual features of
the physical road network. Surely, this would not make sense, as we'd
need separate datasets for rendering and routing.)

    /   TM
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