These alerts definitely work. I live in Northwest Pennsylvania and commute across the country to work every day. Yesterday, during my morning drive before sunrise, the dollar just fell off my shoulder. The deer ran beside the road. As I got closer, the deer turned right and ran away from my car into the field. Driving home late at night, I drove down a road where tall grass completely blocked my view. The deer jumped out of the grass 20 feet in front of my car. The deer ran. The deer quickly turned 180 degrees and returned to the grass as we almost collided. Without a doubt, without a warning on my car, I would have run over any of those deer. I've had many other instances of deer stopping by the side of the road to look at me, even in the dark when exposed to "deer in headlights". There is no guarantee that you will never encounter a deer, but these warnings will definitely reduce your chances.
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