I had lost my whistle, and the other day I shelled out for a new one at [unnamed discount store]. Set me back $3.00!
This one is
much louder than my previous one! I am so happy now that I can express my displeasure with motorists who
want to sit in my lap, or who may not be looking as they are entering
MY lane from a driveway or sidestreet.
It's one thing they don't expect: getting "whistle-blown." (It has saved me before. Visibility of cyclists is sometimes an issue with motorists, so I make sure they don't have an excuse.)