If that were true, insurance companies would recommend them and provide a deer whistle discount.
Mike, Perhaps most vehicles are used where deer do not roam so companies do not want to give a discount for a no risk situation.
Most vehicles are used where deer DO roam. You obviously haven't spent much time in New York, West Virginia, Pennsylvania, New Jersey, Ohio, Illinois, Indiana etc. These are very populous states with numerous highways loaded with deer. In fact, the average motorist in the US has a 1 in 169 chance of hitting a deer each and every year. This costs insurance companies billions of dollars every year. Insurance companies take this kind of money very seriously. That they don't give deer whistle discounts (or even recommend deer whistles) to encourage safer behavior of their insured speaks loud and clear to the lack of effectiveness of deer whistles.
Please provide a reference for where "State Farm recommends against deer whistle."
https://www.statefarm.com/about-us/newsroom/2015/09/14/deer-collision-dataState Farm Insurance said:Do not rely on devices such as deer whistles
The whistle is to improve awareness. At less than $5 on Amazon, the expense is not a big deal.
but there is not a shred of evidence that deer whistles "improves the awareness" of deer. And that deer whistle will cost you a lot more than $5 if it causes a deer to spook in front of your vehicle as your cruising along at 70 mph.
Your references are opinion and single examples. The research article is 13 years old.
The research I linked to that showed deer whistles are, at best, ineffective is 13 years old? So what?
Maybe cigarettes are not harmful anymore since all the research is over 13 years ago? Maybe in the last 13 years deer have evolved to avoid deer whistles? Get real. It sounds like you are grasping at straws.