plain brown rat snake.
Turbo looks like you found a black rat snake, they give off a smell and shake there tails like a rattler in the leaves, against stuff to scare predaters. The other maybe big grass snake. Not sure, what snakes are in Idaho. I get garters, black, and rat snakes here.
Good thing he didn't show himself while you were driving! My first morning in Ft. Bliss I was tossing the trash into the dumpster when a 10 foot rattlesnake slithered out and landed at my feet. He gave me a look like "I had a rough night- don't bother me" and he disappeared under the dumpster.
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