The Delaware Memorial Bridge is a dual-span suspension bridge crossing the Delaware River. The toll bridges carry Interstate 295 and U.S. Route 40 and is also the link between Delaware and New Jersey. The bridge was designed by the firm known today as HNTB with consulting help from engineer Othmar Ammann, whose other designs include the Walt Whitman Bridge (which is similar in appearance to each of the Delaware Memorial Bridge spans, except for being a single span with more lanes) and the Verrazzano-Narrows Bridge. It is also one of only two crossings of the Delaware River with both U.S. Highway and Interstate Highway designations, the other being the Benjamin Franklin Bridge.