[OSRM-talk] Fixing routing with tags

[Florian Lohoff]

On Mon, Dec 11, 2023 at 12:25:40PM +0000, Nils Nolde wrote:
> Hi Florian,
> 
> IMO this needs to be solved with conventional tagging and/or
> heuristics (increase penalty to switch to lower hierarchy roads, less
> turns or such). I'm missing the argument why you think those routes
> are bad. I guess it's because they're taking a shortcut on lower-level
> roads instead of staying on the high-level roads? Sounds similar to
> dive-bombs (classic: during congestion, take the off-ramp only to join
> the highway 1 km further on the on-ramp, just to save 5 mins of the
> traffic jam). Essentially that IS the cheapest route, but you (and me
> too) consider it asocial behavior to have through traffic take those
> residential roads just to save 2 seconds. So we'd need to cost those
> way segments more or the transition onto those.

Just look in my examples - they are correctly tagged by their physical
capabilities and still the engine thinks the "rough side road" is faster
than taking higher class roads. And as i said, i can create hundrets of
such issues right now for ANY routing engine.

So at the end and completeness of physical tagging - how to we proceed
in fighting down road priority?

This will be a serious issue once people really start using OSM and we
have city councils opening issues with OSM telling us not to send people
down a specific road.

How do we do that?

And i'd like to define a way on how WE as a community try to solve this
issue for ALL supporting routing engines.

Its a 3-5 line addition to a OSRM profile and a tag i can invent right
now. I can solve that for _me_ in less than 5 minutes and start fixing my
issues i find, but this will stay broken for all other engines/profiles.

And i fix those issues on a daily basis in OSM for 10 years, and there
are 1-3% of rat-race/shortcut ways i simply cant fix just by correcting
physical tagging/tags available.

Flo
-- 
Florian Lohoff                                                     f at zz.de
  Any sufficiently advanced technology is indistinguishable from magic.
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