A tractor-trailer hauling fireworks caught fire late Sunday on Interstate 287 South in Somerset County, leaving parts of the highway shut down for the early morning commute on Monday, authorities said. The New Jersey Department of Transportation said the truck’s trailer caught fire in the southbound lanes near Exit 14 and Route 22 in Bridgewater. Video from the scene showed fireworks shooting off and lighting up the darkened highway after the crash. No injuries were immediately reported. As of 8 a.m. on Monday, one lane on the highway remained closed with two left lanes moving in the area of E…