I WAS ON MY WAY TO FLORIDA, DRIVING SOUTH ON I-95 (GOING THROUGH THE TOWN OF ST. MARYS) WHEN I RAN OVER A GREY METAL GRATE (THE SAME COLOR AS THE ROAD) THAT WAS IN THE MIDDLE OF THE LEFT LANE (I WAS DRIVING 70 MPH). THE GRATE WAS APPROXIMATELY 1FT X 1FT AND ABOUT 1 INCH THICK. AS SOON AS I RAN OVER IT, THE SIDE CURTAIN AND THE SIDE SEAT AIRBAGS (ON THE DRIVER'S SIDE) DEPLOYED CAUSING DAMAGE TO THE SEAT, SEAT BELT, AND MY LEFT ARM WAS BURNT. *JB