If you're doing 80 on a rural Texas highway at night, you're an idiot. You should see the damage that hitting a good sized critter can do to a car and its occupants.
The speed limit at the Arkansas/Texas border drops 10 mph at night. It is no darker in Arkansas, nor are the critters any smaller.
I'm sure you called me an idiot in a positive way.
That's what deer/animal horns are for. Take the critter factor out of the picture...