US roads and airports are getting jam-packed, but that has nothing to do with Thanksgiving. Americans have been traveling in record numbers this year, thanks to a stronger economy and cheaper gas. According to the National Highway Administration … Driving has increased by 3-percent since September, compared to the same period last year.According to the Bureau of Transportation, air travel has seen a bigger jump…Rising 5-percent through August. Airlines have filled 85-percent of their seats so far this year. This Thanksgiving travel period is expected to be the busiest in eight years.