it is not necessary to run it over! Snakes are very important creatures and killing one is a minor ecological disaster! they control rodents and other pests and most of them are non-poisonous! The poisonous ones rarely bite humans and when they do the bites are rarely fatal! If you'll slow your fucking car down and drive the speed limit for the rest of your life you'll save more human lives on your own than snakes will kill in the US in the next 20 years. What did snakes ever do to you?