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Hahaha, that's funny, I just record the same thing on my way to work while I was sitting at a long light. Use to only get the occasional side stepping car next to me looking like it was crossing the line. Now more often the cars are doing the dance.
Well I'm om 8.5 an I've never seen the dancing as bad as it is now. I've been through countless updates over the year I have had my 3 and while previously the displayed cars danced around a little they never before had 90 degree shifts! For me anyway this update is the worst in that regard by far.