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The blasting air horns so beloved of truck drivers can burn out easily if used too long and too loud. But Wolo Manufacturing in Deer Park, New York, has a cunning plan: replace air horns with tape recordings of their sound (WO 02/070302). A 40-second recording of a conventional air horn is recorded at CD quality and stored in a memory chip. A timer circuit is programmed to repeat the recording at a rate that mimics a honking driver. The playback is fed through a powerful amplifier and heavy duty speaker. So the driver can still scare the wits out of any hapless hatchback drivers who get in their way.