This photo provided by the Oregon Department of Transportation shows the scene of an accident on I-84 in Oregon Saturday, Jan. 17, 2015. Black ice is believed to be the cause of a freeway pileup involving more than a dozen tractor-trailers Saturday morning in eastern Oregon, police said.(AP Photo/Oregon Department of Transportation)
This photo provided by the Oregon Department of Transportation shows the scene of an accident on I-84 in Oregon Saturday, Jan. 17, 2015. Black ice is believed to be the cause of a freeway pileup involving more than a dozen tractor-trailers Saturday morning in eastern Oregon, police said.(AP Photo/Oregon Department of Transportation) AP
This photo provided by the Oregon Department of Transportation shows the scene of an accident on I-84 in Oregon Saturday, Jan. 17, 2015. Black ice is believed to be the cause of a freeway pileup involving more than a dozen tractor-trailers Saturday morning in eastern Oregon, police said.(AP Photo/Oregon Department of Transportation) AP