Sadly, I don't think that's actually possible... the nature of guests--clumped together in groups with large hitboxes--makes anything narrower than 4 meters impossible for them to traverse. There are mods that let you make paths narrower than 4 meters, and I've made doorways that were less that 4 meters wide, and my guests just get stuck until I make things wider. It works for cue paths, but those function very differently...
One-way paths I'd imagine would be doable, but I'd assume they'd involve special curbs with one-way function, rather than a type of path...