... Feet12Material Usage and Condition of Existing Bridges in the U.S.Table A.3 – Number and Deck Area of Bridges with Main Span Material of Concrete (RC and PS) for All BridgesNumber of Existing Bridges ... Branch, Office of Bridge Technology, Federal Highway Adminis-tration, Washington, DC, December 1995.4. Dunker, K.F. and Rabbat, B.G., “Assessing Infrastructure Deficiencies: The Case of HighwayBridges,” ... Conditions and Performance, Reportto Congress,” Federal Highway Administration, Washington, DC, March 2003.3. “Recording and Coding Guide for the Structure Inventory and Appraisal of the Nation’sBridges,”...