What the "No U-Turn" setting really means.

[Grumpy Goat]

Sometimes I use a few miles of interstate to get to a 2 lane road I want. The GPS will fight you if avoid highways selected.
A lot of times I shut the sound off so I don't have to listen to Bitching Betty.

That may be why I don't have issues with this ... I don't have highways avoided. I actually like freeways and highways for a bit, and usually I have to actually make an effort to reset to curvy roads if I am tired of all day "freewaying".

One time I did that and it gave me a curvy route allright ... some BS route through a neighbourhood. I quickly turned that nonsense off and set it back to "regular" (for me) and continued on my way.