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Yes the turn signal on the model 3 has flaws, I took mine in for maintenance and they gave me an old S, and the S's turn signal behaved like I expected (like my old Caddie did). I'm always flashing my 3's turn signal all day like i'm an old man.
The trick with all sedans and long items is to get the passenger seat down and put it through the passenger window. I've transported 8 ft studs this way.