Being a land surveyor I see my share of snakes, poisonous are very rare.
I chaperoned school a trip years ago with my younger son, they went to a Seminole Indian reservation that had a reptile / snake presentation. I remember the words of the man giving the presentation to this day. He said, 80% of snake bites occur due to the person(s) that encountered the snake messing with it.
If you see a snake, avoid it, it will be gone in a matter of minutes, it does not want anything to do with you. I understand there are exceptions to that rule, except it is a good rule.
In years past I have encountered water moccasins and rattle snakes. In the case of the water moccasin, we decided it was going to eventually kill us if we did not kill it, we failed but almost got bit screwing with it.
I think I posted this pic here already in pics on your cel phone. I came across this very healthy Coral Snake a few weeks back, I was heading to put a stake where he was laying. I changed my plans, 1 minute later he was long gone.
