A tractor-trailer overturned on I-95 in Volusia County on Tuesday, causing traffic delays for several hours. What we know:The crash happened around 7:15 p.m. on I-95 southbound at mile marker 274 in Ormond Beach, according to the Florida Highway Patrol. A crash Tuesday shut down all lanes of I-95 southbound in Volusia County. The crash initially caused officials to close all southbound lanes. FHP said the crash remains under investigation.