>  The directional speakers "aim" sound only at the roadway approaching the 
> tracks.  Thus, car drivers hear the recorded horn clearly, but adjacent 
> houses hear nothing.   Ed L.

> If you (or the people in the adjacent houses) believe that, I have a bridge I 
> need to sell, and California needs to own - cheap!
> Bob Nicholson

Bob....Click here and you will hear.  Cheers....Ed L.

http://www.youtube.com/watch?v=ErPVfLStPus&feature=youtube_gdata_player





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