[Tagging] Access tag abuse examples

[Mateusz Konieczny]

May 25, 2020, 11:06 by colin.smale at xs4all.nl:

>
> Is there a uniform definition of "motor_vehicle" in terms of its constituent vehicle classes? Do the constituent classes also have a uniform definition? A problematic example is "psv" where its status is not simply a function of the vehicle's construction or taxation class, but also of the use to which it is being put. If a taxi driver takes his taxi on holiday? A bus running empty back to the depot?
>
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And that is why psv is useful. Lets say that in given territory it applies to bus on route with public
and scheduled traffic and it does not apply to bus running service that is not accessible to public.

It is impossible to tag such difference using vehicle class tags.

Similarly, if one see "public service vehicles allowed" (or in Poland "nie dotyczy pojazdów
transportu publicznego") psv allows one to tag it without detailed knowledge how to create
massive complicated restriction that would use conditional syntax.

>  This is going to depend on the specific jurisdiction.
>
Yes, routers need some are-relevant info and ask user to provide routing matching law.

>  How we word the definition of the OSM tag is of major importance if we are to avoid endless arguments about these edge cases.
>
+1 - that is main benefit of proposal process, you may avoid this before tags gets popular

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