I've only had to use my bell once - so far. I had to "ping" someone who was blocking the sidewalk ramp I was about to go through. I loved her reaction though. Without looking my way she moved a nano inch away from the ramp.

I had to do a tight turn on my trike to avoid hitting her. Idiot!!! God forbid I inconvenienced her talking to her friend on the street.

Most of the time though I don't have to use the bell. People give me a wide berth. A trike is hard to miss and I'm not exactly breaking any speed records anyway. People usually have plenty of time to get out of the way by the time I go by them.