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For the former State Route 233, see State Route 233 (Virginia 1933-1949).
State Route 233, or the Airport Viaduct, is a primary state highway in Arlington County, Virginia, United States. It is a short elevated highway connecting U.S. Route 1 with Reagan National Airport, passing over the Richmond, Fredericksburg and Potomac Railroad (CSX), the Washington Metro Yellow and Blue Lines, and the George Washington Parkway. SR 233 is an intermodal connector in the National Highway System.