Put Deer Whistles on Truck for Boulder Trip

I put a similar pair of Deer Whistles on our truck for Boulder trip next week.



Has anyone had any experience with these? Do they work? Please comment below if you had good/bad/any experience with these. Thanks.

There are several spots on the way to the front range, that deer at night in the wintertime provides a WHITE KNUCKLE driving experience, so if this improves my odds a little bit, I am happy.

Very simple installation, however, the first snow bank we hit while parking, will probably knock them off. We will see.....