They confuse some out-of-state drivers (as if they’re not confused enough) and they make getting around town more difficult for the locals. They only allow you to turn left. If you want to simply get from one side of the highway to the other then you’re SOL. You have to drive down to the next available turning lane and hope (you picked the correct one, while you are busy trying to keep watch out for other drivers doing the same thing) it turns in front of where you wanted to go.

I can see how they help traffic, but they are just awkward.