It's open range.
The cattle were there first. Drive your horseless carraige at your own risk.
Same way in most of Montana.
Same thing here in northern Nevada, if you drive the speed limit and pay attention you're usually OK.
There is a mean bend in the road down the street.
The sign says 45mph and its a blind curve - every summer- eagles,cows,horses,antelope end up as hood ornaments because folks get so used to going 70. When its a cow its always the prize cow worth a ton of money, and you will pay.
Its open range, even though the cows are gated they still manage to get on the road. The wild horses just stare at you hoping you have a carrot ... one time a bull wandered into our garden and I managed to shoo it away, wondering if a .40 would simply bounce off its skull if I needed to use it.