Subsection (3)(B) of 40-6-21, which is what you posted gives you your answer. "Vehicular traffic shall yield the right of way to other traffic lawfully using the intersection." If there is not a sign there preventing her from making a u-turn, she has the right of way because she is lawfully using the intersection. For those who say she has to remain in the far left lane leaving the right lane for you to turn into, I say BS. I would like to know what kind of cars you are driving that can make a complete u-turn without going into the right lane.

To quell any arguments, I asked a guy I know who has been a cop for over 20 years and used to teach traffic law at the police academy. He said the driver turning on red must yield to everything. U-turn driver has the right of way on a green light. You would get the ticket and be at fault in the accident.

There you have it.