Intersections aren't race courses.... whether you are doing a 90 or a 180, you should be travelling at a modest speed, and doing a 180 in no way should be slower than a 90, so you would not be slowing down the cars behind you.LOL, and you'd know I'm a crappy driver based on what? The fact that I consider those who make U turns at intersections forcing everyone else behind them to slow down while they make their U turn selfish fucks?
I see you've donated your brain to science while still alive.