New Hampshire State Police are looking for the driver of a black SUV that struck and seriously injured a 78-year-old motorcyclist in Nashua. Police say the man was on the Exit 5 northbound ramp for the Everett Turnpike Thursday morning when he was clipped by a black SUV. Witnesses say the collision caused the motorcycle to roll over and the driver suffered severe head trauma. The accident occurred at about 10:30 a.m. Police are asking for the public’s help in identifying the SUV and its driver. They say the vehicle should have scrape marks on its passenger side.