[talk-au] Routing problem near Albany, WA

[Ian Steer]

Ben, thanks for the suggestions - I'll give them a go.

Ian
> 
> 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&rout
> e=-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
>