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Clearly not AI. Here's where you can find the trail types, OP, including "standard terra trail". As @wjrii@lemmy.world notes, it's used to distinguish from things like snow trails.

And here's where you can find, centralized, that verbatim definition. It's pulling from a prebaked list of definitions as @Onomatopoeia@lemmy.cafe suggests.

a. Standard Terra Trail: A trail that has a surface consisting predominantly of the ground and that is designed and managed to accommodate use on that surface.

b. Snow Trail: A trail that has a surface consisting predominantly of snow or ice and that is designed and managed to accommodate use on that surface.

c. Water Trail: A trail that has a surface consisting predominantly of water (but may include land-based portages) and that is designed and managed to accommodate use on that surface.

That's a reasonable way to express it when other options are "predominantly not the ground".

My immediate question is precisely what constitutes the remainder. That seems like important information.

You're not an idiot. It's impossible to tell the difference between a robot and a bureaucrat.

Given the structure I wonder if the phrasing is a default and it pulls from a database for the surface material.

Maybe it means as opposed to constructed or paved walkways

geez people are already having AI psychosis, are we also going to have anti-AI psychosis now?

Only the trails a T-800 has visited.

I'm not entirely sure but I'm pretty sure the ground is made of ground