Reply #15: Well, given it's a mining state and you were on rural highways yes, probably normal.

[DRoseDARs]

As said elsewhere, likely equipment mine-bound. Given its size, the NHP had to follow procedure to get people moved completely out of the way to ensure safe passage. I suspect the weaving pattern is common in every state, you've just never seen it in person. I've seen footage of it from California, though I don't recall the context.