[Routing] Complex Access Tag Interaction - Wiki vs. Data

[Daniel Hofmann]

What's your take on access tags and parsing complex access tag hierarchies?

The most recent example we stumbled upon was

> highway=steps + access=permissive

for which the Wiki states that the access tag applies to _all_
transportation modes. This would mean cars should route over steps, which
makes no real sense.

The discussion and more information from a couple of weeks ago:
https://github.com/Project-OSRM/osrm-backend/issues/3435

I'm quite interested in ideas what to do in cases where the Wiki states one
fact but the data out there is mapped in a different / the opposite way.
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