An object that fell off a highway overpass broke the windshield of a car on a highway in Orange last night, slightly injuring the driver, the New Jersey State Police said. Investigators have not determined whether the object, which was not recovered, was thrown or if it fell off the overpass of Interstate 280. The victim, who lives in Montclair, was driving her Volkswagen Jetta near Exit 11B around 8:45 p.m. when the object pierced the windshield, and pieces of glass cut her face. The woman, who was able to stop the car safely, was taken to St. Barnabas Hospital in Livingston. While reports of objects falling off overpasses are now rare, a State Police spokesman said that officers had received them daily before fences were put up on the overpasses a few years ago.