Weird routing
Hi @guidomm,
I’m getting weird routing in this route around points 10-12. I’ve checked on openstreetmap, Google and Apple but can’t figure out what’s happening. It’s a single straight road from 10 to 11, then a right turn to 12, but Scenic wants to put a weird detour in.
The route is here (I’ve cut the start for privacy)
https://scenicapp.space/route/piMUovWL
The junction just after via 10 has turn restrictions in OpenStreetMap:
https://www.openstreetmap.org/edit?way=9215913#map=17/53.779284/-0.649052 (you have to go to "edit" mode on OpenStreetMap.org to see this)
The limitation is easiest to see if you street view the junction. You can see the signs saying HGVs limited etc.
Did somebody just correct this? Now I only see a turn restriction for going left.
https://www.openstreetmap.org/node/26014871 (only one relation. Before there were 2)
I was wrong, there is a restriction for large lorries into North Cave except for deliveries as per the pictures below.
There is a tight right hand bend further into the village that would be impossible for an HGV. Its hard enough in a large car at times depending upon how people position at the junction and where cars are left parked.
When I was thrown by this Scenic wanted to send me on a 67 mile detour rather than the 8 or so miles to home which is more or less the crow flies.
Kevin
Quote from Guido on 04.03.2025, 20:18Did somebody just correct this? Now I only see a turn restriction for going left.
https://www.openstreetmap.org/node/26014871 (only one relation. Before there were 2)
Just for kicks, I went to view the same intersection. Gotta wonder:
This is becoming a long topic, but I think it's important. For me this is also a learning experience with OpenStreetMaps.
So, @dae. I see what you did:
When I try a routing with the Valhalla routing engine (that's the one that Scenic's map provider is using), though, it's not working (yet??).
This could be for 2 reasons:
1). Valhalla is ignoring the "except" field. That would be bad.
Some background: The way Valhalla (and other OSM routing engines) work, is as follows. They take a data extract from OSM, and convert that into another data format / database that is optimized for fast route calculation. It is possible (I don't know), that the except field is ignored during this conversion and/or during the route calculation itself.
2) The routing on OSM is still running on old OSM data that does not contain your change. I took a look FOSSGIS (which is the Valhalla server that is used by the openstreetmap site.) here: https://valhalla.openstreetmap.de/, At the bottom you can see that the latest data extract is from march 5, 9:11 am. (As FOSSGIS is german based I assume this is german time). @Dae, you made your change at 8:42 GMT (which is 9:42 in Germany). This seems to suggest that indeed you did your change after FOSSGISS took it's latest extract.
I suggest following: we keep an eye on FOSSGIS to see when they take a new extract (I suspect they do this once a day). After they took the new extract, we try the route calculation again. If it now works, we can say with relative certainty that this will also be handled by Scenic's map provider once the next map update is released. If, however, the route still calculates wrong, then very likely the "except" field is ingored and it would be better to remove the restriction altogether.
Hope I'm making sense 🙂.
Cheers and thank you!,
Guido
Your correction works @dae. So... now we just have to wait for the next map update from Scenic's map provider.
