the women were traveling near savannah in two vehicles when a tractor-trailer plowed into an suv , then rolled over a small car .
killed were emily clark , morgan bass , abbie deloach , catherine pittman and caitlyn baggett - all juniors at georgia southern university .
the georgia state patrol said three people also were injured and seven vehicles were damaged .
it could take investigators months to determine whether to file criminal charges against trucker john wayne johnson .
johnson was employed by trucking company based out of mississippi whose drivers have racked up 266 violations over past two years .