Yesterday I was riding on Greenway our version of a MUP. I rang my bell twice because one ring sounds exactly like an iPhone text alert. I also say "coming up behind you!" Sometimes if they don't turn/ wave/ respond.
These two ladies were walking. I rang my bell and said coming up behind you and the switched sides.. they were walking more to the edge of the path though and I was laughing as I rode between them. I said you all switched sides and they said yes and kept laughing. it was funny.