If there’s a long line of cars behind you and you stop to let me turn across traffic, thanks, the courtesy is appreciated. If, on the other hand, there is no one behind you, I am already planning to make my turn after you, and it benefits neither of us if you slow down and force me to guess whether or not you’re yielding to me. This goes doubly so when I’m on a bike. Please don’t force me to dump all my momentum and unclip while I figure out what you’re doing when I could just cut in behind you at nearly full speed. Remember: I’m turning left, that means I have to yield to you, not the other way around. Sincerely, someone who has to share the road with you.