This article shall apply to all cases where grade separation structures on state highways across railroads are, in the judgment of the Department of Transportation, for any reason inadequate for the traffic on the highway, but shall not apply to grade crossings. This article shall not be construed as relieving any railway company from any obligation or duty now borne by or resting upon such company in connection with any grade separation structure.
S.C. Code § 58-15-1940