[Tagging] Using restriction and restriction:vehicle for the same restriction relation should be discouraged

[easbar.mail at posteo.net]

Yes, sounds good to me :+1:

One more interesting case I found is this: 
https://www.openstreetmap.org/relation/10344810

restriction=no_right_turn
restriction:bicycle=give_way

But what is that supposed to mean? There are only two (2) such relations 
with restriction and restriction:bicycle=give_way tags. To me it seems 
like it would be better to use a separate relation for the give_way tag.

In conclusion maybe what should be stated in the wiki is the following?

* out of all restriction:vehicle[:conditional] tags the most specific 
one counts. redundancy should be avoided.
* combining restriction and restriction: is discouraged with the 
exception for future proposals where something like 
restriction:bicycle=unrestricted could replace the except tag
* give_way and maybe others should not be mixed with the no_<...> and 
only_<...> turn restriction tags

On 29.10.22 10:07, Tobias Knerr wrote:
> On 29.10.22 07:13 easbar.mail at posteo.net wrote:
>> I like your idea of not using the except tag but rather something like 
>> restriction:value=unrestricted. Actually that would be the first 
>> useful combination of restriction and restriction:vehicle that I have 
>> heard of. But unfortunately this is neither mentioned in the wiki nor 
>> does it seem to be used that way.
> 
> Yes, this is something that would require a proposal to introduce, it's 
> not established practice at this point. The reason I mention it in this 
> discussion is indeed that it would be one example where restriction and 
> restriction:vehicle on the same relation could meaningfully coexist. So 
> I wonder if a wording could be used that would leave this door open for 
> the future, e.g. by discouraging "different types of restriction on the 
> same relation" (or some better wording to the same effect).
> 
>> I'm still wondering: Do we ever need different restriction values for 
>> different vehicles, or for different conditions, for the same relation?
> 
> No, with the exception of the "unrestricted" concept I mentioned, this 
> should never be necessary. Even if there is an obscure real-world 
> situation with different restrictions on the same turn (same 
> from-via-to) for different vehicles, it could be modelled with separate 
> relations.
> 
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