I WAS HEADING SOUTHEAST (INBOUND) ON HIGHWAY 290. IT WAS CLEAR, ROADS WERE DRY, AND NO DEBRIS IN THE ROAD. I HAD MY 16-YEAR OLD DAUGHTER WITH ME. I WAS DRIVING AND SHE WAS IN THE PASSENGER SEAT. I WAS IN THE FAR LEFT (PASSING) LANE. OUT OF NOWHERE, MY SUNROOF SHATTERED AND FLEW OFF MY CAR. IT SHATTERED MOSTLY INTO A THOUSAND PIECES, BUT THE PERSON DRIVING BEHIND ME INDICATED THAT A HUGE PIECE FLEW OFF AND HIT HIS WINDSHIELD CAUSING IT TO CRACK IN MULTIPLE PLACES. MY SUNROOF HAD BEEN CLOSED. MY INTERIOR SHADE WAS ALSO CLOSED. THERE WAS NO REASON THIS SHOULD HAVE HAPPENED. *TR