[Tagging] Feature Proposal - RFC - highway=scramble

[martianfreeloader]

Yes, what I have in mind is a new primary tag:

`highway=scramble`

with secondary tags like

`scramble=via_ferrata`
`scramble=climbing`
`scramble=alpine_hiking`
etc.

Tertiary tags would be:
`via_ferrate_scale=*`
`climbing:grade:uiaa=*`
`sac_scale=*`

The secondary tags would be orthogonal. In case of conflict, the most 
common use of the scramble should be tagged. The tertiary tags can be 
used side by side if applicable.

-----------------
*Implications for data consumers*

`highway=scramble` for data consumers basically means:

1a) Don't render this as normal paths.
1b) If you do render it, render it differently.
2a) Don't route pedestrians along here.
2b) If you do want to route specialists here, then have a look at the 
secondary (and tertiary) tags.


-----------------
*Obsolescence of other tags*

This would mean that there is a new primary tag `highway=scramble` which 
makes some currently existing primary tags obsolete:
1) `highway=via_ferrata` gets replaced by `highway=scramble + 
scramble=via_ferrata`
2) `climbing=route` gets replaced by `highway=scramble + scramble=climbing`
3) Paths on the difficult end of `highway=path + sac_scale=*` get 
replaced by `highway=scramble + scramble=alpine_hiking + sac_scale=*` 
(exact difficulty threshold to be discussed, see below).


-----------------
*Detailed definition(s)*

This is just a coarse sketch.

If it gets any support, then yes, the details would certainly need to be 
thought through and discussed:
- What's the exact scope of highway=scramble? Does it include caves or 
tunnels where you have to crawl? (I'm sure there are many other examples 
that haven't been mentioned yet)
- What are the exact thresholds between path and scramble?
- What counts as special equipment?
- etc.

I suggest we first decide whether we find the general concept of 
highway=scramble to be useful and want to introduce it at all. In case 
we answer this positively, then focus on working out the exact details 
like what's the exact sac scale threshold, etc.


Cheers,
martianfreeloader


On 20/09/2022 12:46, Martin Koppenhoefer wrote:
> 
> 
> sent from a phone
> 
>> On 20 Sep 2022, at 10:56, martianfreeloader <martianfreeloader at posteo.net> wrote:
>>
>> This would encompass
>> - via ferratas
>> - demanding or dangerous hikes
>> - climbing routes
>> - anything else?
>>
>> To me, highway=scramble seems a good solution for this, but I'm not a native English speaker, so there may be better terms that I'm not a aware of.
> 
> 
> 
> just to get it right, you are suggesting to deprecate highway=via_ferrata in favor of highway=scramble?
> 
> AFAIK climbing routes aren’t currently tagged as highways, why would we want to have them in the same category as hiking paths?
> 
> Is a torch qualifying for special equipment? E.g. paths in caves that aren’t lit?
> 
> What kind of shoes would you consider special equipment?
> 
> Is special equipment and extraordinary courage a requirement that is relative to local habits or is it to be seen on a global level?
> 
> Cheers Martin
> 
> 
> 
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