TRAVELING FROM RI TO WESTERN NY. DEPARTED RI IN AM WITH MODERATE RAINFALL WHEN "EYESIGHT DISABLED" INDICATOR FLASHED SEVERAL TIMES OVER THE COURSE OF HALF HOUR. WHEN RAIN SUBSIDED, INDICATOR DISAPPEARED. SEVERAL HOURS LATER, WAS DRIVING 65-70MPH ON STRAIGHT SECTION OF MAJOR INTERSTATE WITH GOOD VISIBILITY, APPROACHING A HIGHWAY OVERPASS WHEN "OBSTACLE DETECTED" WARNING APPEARED DESPITE NO OBSTACLE IN ROAD, AND SHORTLY THEREAFTER CAR WENT INTO A SLOW SPIN (FELT AS IF FLOATING) TOWARDS LEFT, STRIKING A GUARDRAIL UNDERNEATH THE OVERPASS HEAD-ON AND CONTINUING TO SPIN 360 DEGREES AT WHICH POINT I WAS ABLE TO RECOVER CONTROL OF THE CAR. IT FELT AS IF BRAKES HAD ENGAGED (? CRASH IMMINENT BRAKING SYSTEM) ALTHOUGH I DID NOT HAVE FOOT ON BRAKE PEDAL AND I DID NOT ATTEMPT TO BRAKE WHILE IN THE SPIN AS I FEARED ROLLING THE VEHICLE. DESPITE EXTENSIVE FRONT END DAMAGE, AIRBAGS DID NOT DEPLOY. HAD TO LEAVE THE VEHICLE IN ALBANY, NY AND CURRENTLY AWAITING EVALUATION BY INSURANCE ADJUSTER. OF NOTE, 5 MONTHS EARLIER THE WINDSHIELD HAD CRACKED WHEN HIT WITH SMALL ROCK AND WAS REPLACED AT SUBARU DEALERSHIP WHERE THE VEHICLE WAS PURCHASED.