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Three interstates converge in central San Antonio: I-35 from Dallas and Austin to the north continues south to Laredo, I-10 from Houston to the east northwest after passing through San Antonio, and I-37 connects San Antonio to Corpus Christi. Other U.S. routes and Texas highways also lead into the city, including U.S. 281 and U.S. 90. Two highways loop the city: I-410 encircles the heart of San Antonio; Highway 1604 makes a wider circle.