I'm aware of one case. Driver was pulled over in Canada for not using a turn signal. The driver does the sovereign citizen thing and gets arrested. He goes to court saying the officer didn't have the authority to pull him over because of all the sovereign citizen nonsense.

The judge rules in his favor because, by a coincidence, he was right, but for the wrong reasons. Under the canadian highway code failing to signal alone is insufficient cause to pull someone over. The officer in fact did not have the authority to pull him over.

Source: Paraphrasing my memory of a video from Leonard French several years ago.