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They don't really work.
Is the whistle louder than the sound of your vehicle and the road?
Is that sound going to reach the deer before it's too late? What about when the wind is blowing in the other direction?
https://www.researchgate.net/publication/228505867_Analysis_and_effectiveness_of_deer_whistles_for_motor_vehicles_Frequencies_levels_and_animal_threshold_responses
I wonder if you can just blast that over speakers to get around the loudness issue?
Driving on the highway, at speed, will put out at least 75 dBs.
80 is generally the line drawn when you're causing hearing damage in humans. If you're blasting out the sound to go over the sound of the vehicle, you are causing other issues.
Edit:
I probably should've re-linked the article I posted earlier in the branch, and thrown in a quote with one of the example findings:
It's 80db for like 12hrs, btw.
That is true, but the speakers would probably need to be much louder than 80dB. The loudness required changes on a few factors, just I threw out one of the many ways that driving is awful for everyone around the car.
I probably should've re-linked the article I posted earlier in the branch, and thrown in a quote with one of the example findings:
You just put your lips together and blow.