[talk-au] Routing problem near Albany, WA

[Ben Ritter]

The intersection in question is quite new, so I am not surprised that there
are cache issues as you guys have identified. Each routing engine will
ingest new OSM data on its own schedule.

One thing that I noticed with the spurious "at the fork, turn right onto
Albany Hwy" instructions in the original OSMR link
<https://www.openstreetmap.org/directions?engine=fossgis_osrm_car&route=-34.9226%2C117.7915%3B-34.9670%2C117.8239#map=16/-34.9652/117.8223>,
is the lack of `_link` roads. I would expect the on- and off-ramps to be
tagged as `highway=trunk_link`. I suspect the routing engines are expecting
the same, and therefore seeing the Menang Dr slip road
<https://www.openstreetmap.org/way/1077469017> as a legitimate fork in the
highway.

The latest incorrect directions with "turn sharp left" are probably the
result of missing turn restriction relations
<https://wiki.openstreetmap.org/wiki/Relation:restriction>. I would expect
some "no_u_turn" restrictions where slip roads join the two-way hwy way.
For example, https://www.openstreetmap.org/way/1077469012. Some routing
engines will infer this from the angle of the ways, but not all of them.

Cheers,
Ben

On Fri, 9 Jun 2023 at 03:39, <forster at ozonline.com.au> wrote:

> Ian
> Looking again at the routing:
>
>          1. Continue onto Menang Drive        20m
>          2. Keep right onto Menang Drive        130m
>          3. Turn sharp left onto Albany Highway        20m
>          4. Turn sharp right onto Menang Drive        160m
>          5. Arrive at destination
>
> Its like its working partially off an old cache:
>
> 2. Keep right onto Menang Drive        130m
> It thinks it can get on to Menang Dve, it used to be able, now its
> 130m further east
>
> 4. Turn sharp right onto Menang Drive        160m
> it used to be able, now its 160m of off road driving
>
> The routing engines work off the ways not the tiles don't they? Can
> the router be working off a cached set of ways?
>
> Tony
>
> > Yes Ian
> > I think you are right. It was showing the cached copy even now with the
> > kink. I just refreshed it. The routing is still wrong
> >
> >       1. Continue onto Menang Drive   20m
> >       2. Keep right onto Menang Drive 130m
> >       3. Turn sharp left onto Albany Highway  20m
> >       4. Turn sharp right onto Menang Drive   160m
> >       5. Arrive at destination
> >
> > Tony
> >
> >> Do you mean where Menang Drv curls around and meets Albany Hwy at a
> >> T-junction?  If so, I took the kink out yesterday (?) - maybe the
> renderer
> >> hasn't caught-up with the change when you looked at it ??
> >>
> >> Ian
> >>
> >>> Hi
> >>> Sorry if this is my misunderstanding but it seems that the same mistake
> >> that is made by the routers is being made by some tile >rendering
> engines
> >> too. The standard tile has a kink at the end of Menang Drive
> (1077469021)
> >> which is not there. The >cycleOSM tile renderer does not do this.
> Likewise
> >> the junction of Menang Drive
> >>> (1077469008) is shifted NW by the Standard tile renderer but not the
> >> CycleOSM tile renderer.
> >>> Tony
> >>
> >>
> >>
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