You really have to wonder what tortuous twist along the path of evolution invested deer with the instinct to run full-bore into moving vehicles. If they think the vehicle is a threat (it makes noise, has two "eyes," and usually has "teeth" on the grill), shouldn't they be running away from it, not into it?
Also, deer tend to travel in groups. After seeing the less-than-wonderful outcomes that result from their buddies leaping in the paths of moving vehicles, shouldn't they kind of learn that that's not a smart thing to do? And shouldn't they get the message that roads in general are not deer-friendly places?
There are other animals that meet their deaths on the roads, but usually it's either because they are too slow to get out of the way (as in the cases of possums and skunks), or they're already on the road and get confused trying to decide which way to run to avoid the danger (squirrels, rabbits, etc.). But deer deliberately run toward the danger when they're already in a safe place.
I know that fawns are not afraid of humans until their mothers teach them to be. There's a sort of warbling, snorting sound that they make to impart to their young that something in their environment is dangerous, and the young avoid that thing from that point on. So a deer's fear response is learned, and probably there's even some generalization going on. "Avoid things that move, make noise, and have forward-facing eyes."
Like... cars, for example?
I just don't get it. They're beyond dumb.
-Rich