At the same time, the Maryland General Assembly authorized the State Roads Commission to formulate a comprehensive plan for the construction of bridges and tunnels across major bodies of water in Maryland. These projects would be financed and operated through toll funding. The plan developed by the SRC was ratified by the United States Congress in 1938 under its regulatory powers over navigable waterways. The plan became known as Maryland’s Primary Bridge Program and provided, among other projects, for the construction of a bridge across the Susquehanna River parallel to the overtaxed double-decker structure. Construction of this new span, which was designed by the J. E. Greiner Company, began in February 1939 and was completed at a cost of $4.5 million.