With one exception, each of my bicycles has a bell. They are effective in signaling pedestrians and other cyclists I pass (yes, even at my age).
Well, most of the time, anyway. Sometimes folks are wearing headphones—not just any headphones, but the kind that seem to completely seal off outside sounds. I ring, I shout, they don’t hear me. On more than one occasion, I’ve tapped people on the shoulder or brushed them.
I can almost understand why someone would design a bike around a horn loud enough to clear the way for a ship full of grain in the Bosporus Strait.