Deadly Accidents Mar U.S. Holiday Travel 11 minutes ago Add U.S. National - AP to My Yahoo! Americans by the millions, undeterred by a soggy economy and an elevated terror alert, are hitting the highways, airways and rails this Memorial Day weekend. AAA predicts record numbers of travelers on the road for what is traditionally the kickoff of the summer driving season. AP Photo Travel in the Midwest was complicated when a bridge over Interstate 80 collapsed in Nebraska after being hit by a semi-trailer. The accident, which killed the driver, shut down a 10-mile stretch of the interstate....