Nope, I know of two cases personally where those whistlers failed to scare the game off the road. One was with my wife's aunt and uncle on a trip through Colorado; they clobbered a doe with their Crown Victoria doing 50 mph. The second was my in laws on trip through Arizona; they nailed a 5X6 bull elk with their minivan doing 45 mph. Both of these accidents happened at night an the animals were just standing on the road. The deer was on a blind curve the elk was covered in mud on a moonless night.