WHEW!!!
I will tell you the people around here use those whistle things on your car and they work. The reason is the deer have nooooooooooooo clue you are going as fast as you are. They also expect you to change your path, and they are watching you to see which way you are coming at them.. The whistle thingees let the deer know just how fast you are moving.
I hit a deer once- luckily no one was in the passenger seat in the front as he hit the windsheild. I have had these whistles for years now- and even with allllllllll our wildlife- havent hit one since ( knock on wood.. lol)