Please ignore this post, I posted in the wrong sub-forum.
(my apologies for writing in English)
Was there any decision whether to write these country specific access tags for various moped classes with a capital or minor letter?
Currently we have both versions in the database:
Of the two most used tags I found instances in Belgium only. I looked this up because I had never seen these tags before.
Hello,
This is a difference that is used in Belgium, which you could see in overpass.
Where the law indicates the difference by means of a letter A and B and P.
This should be translated into world OSM access tags.
Better to ask in this part of the forum, although Belgium mappers are reading also here.
https://forum.openstreetmap.org/viewforum.php?id=29 
Belgium conventions
about A and B and P
On traffic_signs.
https://wiki.openstreetmap.org/wiki/Road_signs_in_Belgium#M_Extra_signs
In the Netherlands we use mofa (snorfiets) and moped (bromfiets), the law makes the difference between those two groups.
Rules in the law also stipulate that a snorfiets (mofa) must follow the rules of the bicycle, unless otherwise specified, so a bicycle icon also applies to a mofa (snorfiets) moped.
https://forum.openstreetmap.org/viewtopic.php?id=66453
Oh, my bad. It seems I took the wrong forums’ door. Sure I meant to post in the Belgian forum.