Just in case one's single polite "Ding!" is misinterpreted by pedestrians as insistent, impatient, or even meaning "Get out of my way!" I too have adopted a more sociable approach.
First a gentle "Excuse me" as I creep up alongside them.
Then more of an introduction. Perhaps "Good day - how are you?"
Then I try to engage them in more varied topics, such as the purpose of their journey, or the state of the surface which we are sharing, or the latest score achieved by our local sportsball team.
Unfortunately this is usually met with a stern, straight-ahead stare. or quite often
"Leave me alone, you fucking weirdo!"