Originally Posted by steelbikeguy

boy, when I was still working, I bike commuted and dealt with a few rude motorists (but have to give credit to many folks who were very considerate and respectful!)
In my work in the electronics part of the Big Yellow Machine company, one of the folks handled all of the horns, alarms, etc. that were used on the machines.
He had some air horns on his desk, and I was quite tempted to ask for some used parts for my bike!
The thought of getting buzzed by some jerk and then hitting the button of a big air horn was quite enticing!
However, once I started running the numbers for the size of the battery required to power the horn, I decided that it wasn't really worth it.

If someone does want to play around with an amplifier and speaker, there are mp3 files of train horns available on the web.

Steve in Peoria