Workers inspect the structure inside the 5.3-mile Enasan Tunnel on the Chuo Expressway in Achimura, Nagano Prefecture, in central Japan, on Monday. Concrete ceiling panels fell onto moving vehicles deep inside another tunnel on the same expressway Sunday. Nine people died. (Associated Press)

Workers inspect the structure inside the 5.3-mile Enasan Tunnel on the Chuo Expressway in Achimura, Nagano Prefecture, in central Japan, on Monday. Concrete ceiling panels fell onto moving vehicles deep inside another tunnel on the same expressway Sunday. Nine people died. (Associated Press)