§ 40-6-121. U-turns
No vehicle shall be turned so as to proceed in the opposite direction:
(1) Upon any curve;
(2) Upon the approach to or near the crest of a grade where such vehicle cannot be seen by the driver of another vehicle approaching from either direction;
(3) Where such turn cannot be made in safety and without interfering with other traffic; or
(4) Where a prohibition is posted.