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Lampropeltis zonata multicincta
Beautiful snake about 1 m (3 feet) long. Maybe a false coral snake.
Yosemite National Park, Pine forest.
Great spotting Luis! The Sierra Mountain Kingsnake is a subspecies of the California Mountain Kingsnake. I've never seen one of these before, but I bet it must be a thrill to see, especially when the snake (and all of those colors) are moving fast.