Deer vehicle collisions account for nearly ten percent of all vehicular crashes in the us. Approximately ten billion and economic cost can be attributed annually to those dear vehicle collisions. The bright lights of an oncoming car do temporarily blind a deer. Their eyes are dilated in the darkness, or in the dim light of dusk and dawn when deer are most active. So when the headlights hit them, they tend to stand still and wait for their vision to return to normal.