687 & 683 were clearing a Fire Prevention Detail at Wattsburg Elementary School when they were dispatched to Knoyle Rd @ Jones Rd for a Vehicle Accident, roll over with entrapment.  On arrival 687 reported 2 vehicles moderate damage 1 rolled over.  690 assumed command.  All patients were self extricated, 687 transported 1 to Hamot Shock Trauma and 697 obtained a patient refusal.  683's crew secured both vehicles and assisted PSP and the tow service.  The accident is under investigation.