As snow begins falling in Colorado's Rocky Mountain National Park, the town at its doorstep, finds itself newly isolated. The only year-round road into or out of Estes Park, Colo., now is the Peak to Peak Highway. It traverses a jumble of mountains all the way. It's not the kind of road an ambulance can scream over at 60 miles an hour. "Not while I'm in the back, hopefully," jokes ambulance driver and paramedic Erle Collum. The recent flooding in Colorado washed out the other two roads into town for miles at a stretch. That's bad news for Estes Park Medical Center, the town's only hospital.