text: In December, Zeckendorf asked the NCPC and RLA to formally approve his plan for a 10th Street SW mall, and proposed that the federal government build a "12th Street Bridge" over the Potomac River to help reduce traffic flows along his mall—which now incorporated a roadway.In February 1955, however, the NCPC proposed moving the planned "cultural mall" to 9th Street SW and retaining 10th Street as a major thoroughfare for traffic coming off the 14th Street Bridge. John Remon, chair of the RLA and NCPC vice chair, strongly criticized the plan (which also proposed relocating the railroad tracks) as far too costly. D.C. officials then proposed turning 12th Street into a southbound one-way, 9th Street into a northbound one-way, and building a new 14th Street Bridge span to accommodate the traffic flows. In a compromise, Zeckendorf agreed to revisit his plans to see if one or more of the proposed road plans could be accommodated under his proposed site redesign plan. The road and bridge dispute threatened to cause the failure of the entire redevelopment effort. 