Interstate 581 is open once again, and we now have a better idea about what caused the southbound side to be closed during the morning commute. State Police say a man either jumped or fell off the Hershberger Road bridge into the center southbound lane and was struck by several vehicles.  Investigators suspect it was a suicide, but they still had to treat the highway as a crime scene, thus the southbound shutdown that lasted about three hours. More from WFIR’s Bob Clark.