Anyone use these? The Jeddah bike lane has a pedestrian problem so serious that I just stopped going there. I met some riders who use regular soccer/traffic officer's whistles to run peds off the lane, but I was looking for something a little different, and I'd rather not have the added complexity or a battery-powered horn. I remembered these from back when I was a kid - for a summer - 1982-83-ish, IIRC - those little plastic siren whistles were all the rage in my home town, and I remember they were loud enough to be annoying. What do you think?