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[Robmay]

You mean something like this...
http://advance.uconn.edu/2002/021118/02111812.htm

To summarize from the link..............

.........Following the directions on each package, the team mounted the devices onto a car's front bumper. Using a road closed to the public, they drove the car at speeds ranging from 30 to 45 miles per hour while recording sound and data.

"We tested them strictly from an acoustical point of view," explains Scheifele. He found that the whistles typically produce a signal either at a frequency of 3 kilohertz (kHz) or 12 kHz. Both, as it turns out, are problematic.

The hearing range of white-tailed deer, the most common species in the United States, is between 2 kHz and 6 kHz, so the animal is not capable of hearing the 12 kHz signal.

Although deer may be able to hear the 3 kHz signal, it is only 3 decibels louder than the road noise created by the car, so the signal is buried. Scheifele points out that the situation would be worse with additional traffic in the area or if the wind was blowing.

Since completing the study, a new electronic whistle has been put on the market. Although Scheifele has not had an opportunity to test it, he has examined its advertising claims. He says the specs for the electronic whistle are considerably different from those of the air-fed devices, so "there is a possibility that the electronic whistle is more effective than the air-fed devices."

But even if deer can hear the electronic signal, the UConn scientist questions how one alerts rather than startles the animal. This is where animal behavior comes into play.

"Think about the metaphor 'deer in the headlights'," says Scheifele. "It is used to conjure up an image of someone who is confused or frightened. When deer sense something unusual, we do not know for sure how they are going to react."...................

[LC110]

If they worked every car, truck, motorcycle in Wisconsin would have them.

[grandpadoc]

Deer don't have eyesite like we do. They can't see color or detail, and their retinas are better at seeing light and motion. If your downwind they really don't know your there unless you move. If your coming straight at them in a car or motorcycle its difficult for them to see you (deer in the headlights) until you swerve, then they see (or hear) you and what happens after that is anyones guess. If you swerve the wrong way you might hit them, or go off the road and hit something else.
The mountain lions around here use this to their advanage and just keep still under a shade tree and wait for a deer to pass by and nail them. They have been know to attack mountain bikers the same way in the hills above me. So I guess that puts us just a little above the deer in the food chain.    The ranger issues tags for for mountain lions during the summer sometimes, but he just laughs and knows they will never see one. When the lion senses its being stalked it gets out of of the area and the hunters come back all beat up and scratched from the chaparral with nothing to show for it.
Sorry to ramble, Doc

[bigblock4457]

  I use them and believe they work. I have seen deer just stop and look like what is that..