I've reverted most of the changes to what you put. It's NOT slippery, that was (probably) a myth put about to discredit the route. But OSM is not the place to address that which is why I've removed my change

Hi Thomas,
I'm commenting as a transport planner & also a member of the stakeholder group for the cycle track.
1. While pedestrians aren't banned (in the same way that they're not banned from walking along any road!) the intention is to discourage people from walking here so this was to stop it being shown on route planners as a walking route
2 Horse use is very very very unlikely so happy to delete this - its not a bridleway as you say
3 There is a debate to be had as to whether the one-way tagging is correct
4 There was a question about the slipperiness of the surface which I was trying to address but maybe this is too technical so I've reverted to asphalt