One person was hospitalized Thursday after a car rolled over on Route 24 in Avon, State Police said. The car, traveling northbound, rolled over at about 11:50 a.m., State Police said. The driver suffered serious injuries and was taken to Boston Medical Center, State Police said. The ramp from Harrison Boulevard to Route 24 north was closed for the investigation. The cause of the crash has not been determined.Jacqueline Tempera can be reached at firstname.lastname@example.org. Follow her on twitter @jacktemp.