We ran into one of those at Boyette last year. A bunch of bikers gathered all around the snake and one guy decided to be all gun hoe and get a little closer. All meanwhile nobody could remember if its red on black or red on yellow that kills you. Thankfully snake just crawled through this guy's spokes and went on its way. My policy is.. if its a snake... stay away from it.
I had all too many close calls with snakes. Not counting that one I almost rode over a rattle snake, rode right next to sun basking moccasin, indigo's and black racers always want to get under my wheels, I saw a giant yellow rat snake that was like 9 feet long and fat and it had half of its body across the trail and was not moving until I shooed it with a stick.
I figure if I give them space then they will not bother me and its always better to be safe than sorry.