I have seen so many cars with their brake lights going on when they have passed the flashing signs, so I think the signs are really helping.
Rydw i wedi gweld cymaint o geir â’u goleuadau brecio ymlaen wrth basio’r arwyddion sy’n fflachio, felly rydw i’n meddwl bod yr arwyddion wir yn helpu.