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These are small devices people mount on their motor vehicle in the belief that the sound generated by the device will somehow detour deer from entering the pathway of the traveling vehicle. Their manufacturers promote them as "acoustic attention-getter", alleging deer would react to the whistle by remaining still.These are small devices people mount on their motor vehicle in the belief that the sound generated by the device will somehow deter deer from entering the pathway of the traveling vehicle. Marketing claims suggest that air moving through the device will produce ultrasonic sound waves that warn deer of a vehicle's approach. The deer will then know to "stay clear" of the vehicle to prevent a deer-automobile collision. Their manufacturers promote them as "acoustic attention-getter" devices, alleging deer would react to the whistle by remaining still or clearing out of the way. [[File:deerwhistlesfordummies.jpg]]The primary failures of the concept include the fact that few of these devices produce any appreciable sound and certainly not at an acoustic level that a deer is going to perceive. Very few of the deer whistles produced actually produce any sound at all. Even when ultrasonic sound is successfully produced by the whistle, due to the laws of physics it is a fact that ultrasonic sound does not carry any significant distance. And under the most ideal conditions even if the deer became aware of the sound coming from a deer whistle the deer would have no natural reflex to respond by flight or otherwise. Plenty of research has been published to refute any claims of the advertising effectiveness. Those studies include those conducted by the Georgia Game and Fish Department, Insurance Institute for Highway Safety, Acoustical Society of America's Acoustics Research, the University of Wisconsin–Madison, and the Ohio State Police Department, all of which conclude that the deer whistle will have no influence over whether or not a motorist collides with a deer or any other animal.== Conclusion ==You might observe an individual at the local truck stop purchasing a set of deer whistles along with some lottery tickets and a pack of cigarettes. [[Category:Caveat Emptor]][[Category:People are Stupid]]