A snow plow rests in a ditch after sliding off of Brock Road in Spotsylvania,Va., Wednesday March 6, 2013. Gov. Bob McDonnell declared a state of emergency Wednesday as up to 20 inches of snow piled up in parts of central and western Virginia. (AP Photo/The Free Lance-Star,Dave Ellis )

Photo by: Dave Ellis

A snow plow rests in a ditch after sliding off of Brock Road in Spotsylvania,Va., Wednesday March 6, 2013. Gov. Bob McDonnell declared a state of emergency Wednesday as up to 20 inches of snow piled up in parts of central and western Virginia. (AP Photo/The Free Lance-Star,Dave Ellis )