From what I've seen, you're correct in guessing that the split is often
done for route relations. There's plenty of arguments going either way
on how it should be done.
Personally, I think routers should be able to combine these together if
all the way segments in a roundabout are tagged as such.
I've added routes myself where one roundabout is part of the same route
twice, and considering all the various things we need to split ways for,
roundabout segments in route relations shouldn't be an exception to
that.
---
Thanks,
Andrew Welch
[email protected]
On 27/10/2025 11:04 am, Ben Kelley wrote:
Hi.
I noticed an odd thing at a roundabout recently where my car tells me
to enter a roundabout, and then while I'm in the roundabout it says to
make a left turn (rather than just take a particular exit). AFAIK the
navigation is at least partly based on OSM.
I looked at the roundabout in question and I see it is split into 4
ways ( e.g. https://www.openstreetmap.org/way/1413392271 in Ettalong
NSW).
I'm guessing the split is because of the routes that traverse the
roundabout. (1 x bus route, and 1 x RCN cycle route)
In this situation, would you make the routes apply to the entire
roundabout and keep it as a single way? Or split the roundabout into
multiple ways?
Example: A one-way route turns left at a roundabout, and so normally
only part of the roundabout would form part of the route. Technically
you could go around the roundabout 1 1/4 times to take the same exit,
so the whole roundabout might form part of the route. (e.g. You have
teenagers in the car, and it's your role as a parent to tease them, but
I digress...)
Maybe it's up to the routing software to figure this out, but there
could be strange configurations with multiple connected roundabouts, so
actually it's hard to know that a different way is actually the same
way. (Unless it is in a straight line, which of course it is not here.)
Thoughts?
- Ben Kelley.
_______________________________________________
Talk-au mailing list
[email protected]
https://lists.openstreetmap.org/listinfo/talk-au
_______________________________________________
Talk-au mailing list
[email protected]
https://lists.openstreetmap.org/listinfo/talk-au
