The first cloverleaf interchange built in the United States was the Woodbridge Cloverleaf at intersection of the Lincoln Highway (Route 25) and Amboy—now St. Georges—Avenue (Route 4) (now U.S. 1/9 and Route 35) in Woodbridge Township, New Jersey. It opened in 1929, and has been replaced with a partial cloverleaf interchange. The original cloverleaf interchange design was adapted by the Rudolph and Delano building firm from Philadelphia, from a photo Delano saw on a magazine cover about a highway in Buenos Aires, Argentina. The original inventor is unknown.