This is the time of year that deer/vehicle collisions (DVC) become more frequent.  So I thought that this article on helping to avoid them would be helpful.

http://www.ammoland.com/2016/10/8-tips-avoid-deer-vehicle-collision...

This was an interesting point in the article.

"It is estimated that more than 1 million DVCs occur annually in the United States, resulting in approximately 200 human fatalities and nearly $2 billion in property damage."

I read in another place that about 1.5 million deer are killed by automobiles each year and hunters kill about 6 million deer.  This sounds like there will soon be no more deer left but I also read that there are about 30 million deer and about 12 million fawns are born each year.  So overall the deer herd is in good shape and is still growing.  Even though in a few areas the deer herd is declining due to habitat destruction and other factors, in many areas there are actually too many deer.  Here in Alabama we have plentiful deer even though we have a nearly four month long deer season.  And those 200 human fatalities a year due to DVCs make the deer the animal that kills the most humans.  So us hunters are probably saving lives too!

I have read before that research has shown that deer whistles don't work.

I agree with the don't swerve.  Better to hit a deer than another car head on or hit a tree or overturn in the ditch.

I have never hit a deer while driving but I was riding once with my brother-in-law when he hit a deer.  We saw it along side the road and he slowed down but it darted in from of us at the last second and we hit it.  It messed up the front of his truck but since we had slowed down he didn't lose control.  The deer rolled into the ditch on the other side of the road, then jumped up and ran off.