Interstate 635 is a 37-mile-long partial loop around Dallas, Texas, in the United States between I-20 in Balch Springs and SH 121 at the north entrance of DFW Airport in Grapevine. It intersects I-35E at exits 27B and 27C but does not connect with I-35W. I-635 and a part of I-20 are collectively designated as the Lyndon B. Johnson Freeway; known locally as the LBJ Freeway, or simply LBJ. The roadway is named after Lyndon B. From Wikipedia
