There's a "Right Lane Ends" sign right there, and I'd imagine people unfamiliar with the turn see that sign and their brain just can't catch up with trying to p

There's a "Right Lane Ends" sign right there, and I'd imagine people unfamiliar with the turn see that sign and their brain just can't catch up with trying to process both slowing down for the 25mph turn and a left merge. Might be better to have the left merge occur before the turn, then do the turn. Otherwise you're doing several things at once: Merging, slowing down, and maintaining direction around a turn with a changing radius. Two of those would probably be challenging at once.