A truck's roof was sheared off before it rolled over on Boston's Storrow Drive early Friday morning.Massachusetts State Police troopers responded at 2 a.m. to the crash in an eastbound lane near the Boston University Bridge. Info: Check Traffic ConditionsThe truck driver, a 67-year-old Mattapoisett man, was not injured in the crash, officials said. The truck, which was carrying boxed sprouts, sustained extensive damage in the crash.The Department of Environmental Personnel responded to clean oil that spilled from the truck. The cause of the crash is under investigation.The road was shut down between Cambridge Street and the bridge for several hours.