necessary precautions There are just some signs I'm inclined to think are unique to Singapore. One of them is the one with a '10¢' within a circle and a strikethrough it indicating that there is no fee to enter the toilet, and another one, according to my professor, is the No U-turn sign, a U with a strikethrough. This, I think, should also be a sign that is quite unique in Singapore... It was on the inside wall of an elevator going up to my friend's house, and I took a picture of it because I thought it was so very amusing. By the way these UDDs are actually these twenty-cent coin sized grey plastic thingies stuck all around near the bottom of the walls.