While out mtn biking in Thailand I have come across a lot of snakes. They are almost always boas/pythons and usually it is later in the day. They come out to get the warmth on a paved road or crossing from one banana plantation to another. Most times we would come cruising around a corner in rural areas and before you have time to do anything you have rode right over the snake. I've only had a few snakes actually get inside my house in Bangkok. Only one was poisonous. Sure don't like it.