Don't stop under any circumstances.

From a letter of a friend of mine

On Wednesday, two of my planning section partners and I drove across the top of Sylvan Pass, toward the east entrance of the park. The road passes between two mountains, both covered with lumpy remains of avalanches and many meters of snow yet to slide. The way is carved through the collection of snow, and signs warn you not to stop under any circumstances. We passed over and back at about 10:00, and at 15:00 new avalanches buried the road again as well as a ranger's truck - he was lucky enough to be outside the vehicle and away from the slide. Early tourists coming to the park are going to think it is the middle of winter!