[OSRM-talk] Fixing routing with tags

[Nils Nolde]

If that's an issue for authorities: they're in the best place to make legal changes to how such a road is classified. If they don't want thru traffic they'll need to classify it as "destination only", possibly for certain vehicle types or times or whatever. Again, we shouldn't add things to OSM that don't exist on any level, it's a slippery slope. I can also promise that most communities would revert that pretty much instantly.

As we said, there's ways to algorithmically get around this problem inside any engine, by using proxies for the problem (road importance being one, though there's likely others). That's much more work obviously than just tagging some stuff. But it's the right (and really only) way to go. And if someone wants to get in control of their processes (like routing), they will also need to invest a bit, in this case in developing missing features in a routing engine.

On 12.12.23 19:09, Florian Lohoff wrote:

> On Mon, Dec 11, 2023 at 06:57:00AM -0800, Daniel Patterson via OSRM-talk wrote:
>
>> I agree with Nils - the core issue is OSRM's heuristic for calculating
>> weights.  One factor that OSRM doesn't consider at all is the use of
>> hierarchy (generally prefer higher class roads for most of the route) - I
>> think that might go a long way to improving overall route quality in
>> general.
>>
>> Tagging the map to workaround routing engine shortcomings is not the right
>> way to solve this issue.
>
> OSRM does when using "routeability" but even THEN - At the end of
> physical tagging i still have broken routes in rare cases and i simply
> cant fix them as there is no tagging available for that.
>
> Flo
> --
> Florian Lohoff
> f at zz.de
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Nils Nolde
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