If you're travelling through the Cascades; stay on the main roads, even if your GPS device tells you a short cut is the faster route.  Forestry officials say many of the roads are not plowed during the winter.  Jeree Mills, with the Mt. Hood National Forest says they're seeing an increasing number of vehicles get stuck on roads that aren't plowed this time of year.  You can check their website or a ranger station to find out whether a road is open during the winter.