I've seen video of guys riding around snowbanks and sometimes wading *through* snow that could not be avoided, when the road was closed to motor vehicles. Here is an example; Note he has the whole road to himself! http://www.youtube.com/watch?v=Mp2tWEv7WNg
In the past even during open season, there have been occasional weekdays when it was closed to everyone because they were doing road repair. And trust me, that road *needs* repairs!
BTW Considering the idiotic behaviour I've seen from cagers on that road, I would *prefer* dealing with snowbanks.