On a trip this last weekend, we narrowly escaped hitting a deer. Had the deer been attempting suicide, it could not have timed its jaywalking better. We ended up missing it by inches.
In British Columbia, there are a number of warning signs for wildlife. All of them have sedate-looking animals in profile: moose, bear and cub, etc. Well, except for the deer warning. Now, I know why. (You can see lots of examples at http://www.roadtrafficsigns.com/animal-crossing-signs.)
Also on the same trip, we saw a dead deer on the side of the highway.
Some should not be on the roads.
Drive safely. The life you save may be someone very deer. Or even dear.