I got tired of waving and waving trying to get people's attention so I bought horns for all the mowers. I started last year with the siren from an old truck alarm system. If nothing else it was fun scaring everybody with it. It wasn't as loud as I would have liked but for the most part they would hear it. Over the winter I bought some VW style horns from JC Whitney for around 9 something. They are a little louder so I think they should work pretty good. Just a thought you may want to try.