The wall, which is privately owned, was damaged in a traffic collision and the signals were placed to allow the wall to be propped for safety reasons and to prevent further deterioration.
Niweidiwyd y wal, sydd dan berchnogaeth breifat, mewn gwrthdrawiad, ac fe osodwyd y goleuadau er mwyn caniatáu i'r wal gael ei sefydlogi am resymau diogelwch, ac i atal dirywiad pellach.