Blow Me!

  Don't fly by pedestrians, it's dangerous to them, and you. Watch out for people walking their dog's on long leashes too. Dogs and kids are always famous for cutting in front of you at the worst times. You should always expect the worst possible movement from anything else on the path.
  Using a whistle sometimes helps, but most think it's a train or something. We use our brakes when approaching, if only to make that high pitched squealing sound when braking. This seems to get people's attention, and is better for avoiding collisions. Probably because they think that someone is barrelling down on them. You move quicker when you think you're in trouble.