hour. road crews in oregon are scrambling to clear downed trees, and by the time it s over, more than 2 feet of mountain snow will be on the ground. and that storm is hitting during the busiest travel time of the year as americans head out in droves to spend thanksgiving with friends and family. 43.6 million of us will travel 50 miles or more, and 90% will drive. abc s alex perez has some survival tips to ease the way to your destination. reporter: reena wengard is a thanksgiving week travel pro. she and the kids are making the two-hour drive to see loved ones in indiana to avoid the mayhem of motorists later this week. it can get crazy. trying to get off in the rest areas, it s just people everywhere. reporter: the wengards join some 239 million others clogging roadways this holiday. and as the stress on the roads begins, some relief at the pump. gas prices down 5 cents in the last two weeks. but thanksgiving, carves out a