GWguy
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If you think about it, if you are merging into a left turn only lane; to use your example; all you need to do is what I call "blip" the turn signal. 'sides that.....most of the newer cars now have that feature. Tap the turn signal lever; without fully engaging it; ie; 'when you hear the 'click;' and the signal blinks 2-4 times, give or take a blink.
I never use that feature. It blinks and is off so quickly that if someone has their attention focused at something else for that split second, they never see it, take off your fender and claim you never signaled. Can't prove you did.