Looks to me like a loss of control on ice resulting in a trip into the side of the hill. Doesn't look like there's a trail there or anything; just a very steep and snow covered hill alongside a road. Good news is it looks to have gone over easy! Really not much damage at all.
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ChuckH
"Every morning when I wake up I know it's not going to get any better 'til I go back to sleep again!" Al Bundy