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Alternate US Highway 66 served as the original alignment of Route 66 until a new alignment was built, passing thorugh Plainfield, Illinois as a bypass of Joliet in 1940. The alternate route branched off the main route near Romeoville and headed south, finally rejoining the main route at Gardner. Its total length was about 40 miles, and is now designated Illinois State Route 53. The later "main" alignment of US 66 is near (in some cases under) Interstate 55.