SAVANNAH — Five people died early Wednesday in a head-on crash between two cars on Interstate 16 west of Savannah. Investigators were trying to determine what caused a westbound Ford Mustang to cross the median and smash into an oncoming Kia Soul in the eastbound lanes shortly before 6 a.m., just ahead of the morning rush of commuters heading to work in Savannah. "We've still got a bunch of unanswered questions," said Sgt. 1st Class Chris Nease of the Georgia State Patrol.