Voting has started for mtb:scale:amtb. 
https://wiki.openstreetmap.org/wiki/Proposal:Mtb:scale:amtb

This proposal would add an already established rating system for Adaptive 
Mountain Biking (AMTB) that simply seeks to answer not the skill needed to ride 
a trail, but 'How much support?' This like other well established scales like 
mtb:scale:imba and sac_scale are both well defined yet somewhat subjective but 
does help to answer a key question before going out more than not knowing 
anything going in. This scale does not seek to define how to build a good 
adaptive trail only if the trail as it exists needs support and the ratings are 
provided by other Adaptive riders. This scale have a top end which is when 
enough work is being put in by support member that it's no longer riding it 
become mountaineering. In the same way for hiking once you have to scramble up 
road faces you've entered climbing territory.

This scale was introduced by "The Unpavement" project it has become integrated 
into Trailforks since thousand of trails have been rated but the rating system 
is not closed ans this simply seeks to bring portability of these rating to OSM 
and any platforms based upon it.

Since originally proposed the standard has expanded to answer two more 
questions.
#1 'Was this trail specifically designed to specifications to make it available 
to all adaptive riders?' uses mtb:scale:amtb:inclusive. The rating system is 
agnostic to which specification.
#2 'Are there technical sections that require specific adaptive skills or 
practice?' This could be a bank that if a rider goes to slow on would be 
off-camber so riders need to be able to keep a minimum speed through a turn to 
use one example. These use the mtb:scale:amtb:technical tag.

In summary, all ratings regardless of additional tags start with the question 
most important to adaptive riders: 'How much support do I need?' this scale 
seeks to answer this with a certain level of certainty. I hope this proposal 
passes so OSM can have matter accessibility coverage in our tagging.

Jason 'JP' McCrory (he/him)
NWA Bicycle Advocate - GIS Mapper
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