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Interstate 35 northbound begins at an intersection (controlled by a stoplight) with Business Spur i35 in Laredo, Texas, just north of the Rio Grande and the international border with Mexico. Through Webb, La Salle, and Frio Counties, it has a mostly north-northeastern course, turning more northeastly around Moore. It then cuts across the corners of Medina and Atascosa Counties before entering Bexar County and San Antonio.
Interstate 35 is named the Pan Am Expressway in San Antonio. There, it has brief concurrencies with both i10 and i410, and it serves as the northern terminus of i37. Interstate 35 heads northward out of the city towards the state capital, Austin, Texas.
In Austin, i35 is the Interregional Highway. Throughout Austin, elevated express lanes were constructed on either side of the original freeway. Prior to this expansion, this section included an at-grade railroad crossing, which is extremely unusual for a freeway. From Austin, i35 goes through Round Rock, Temple, and Waco. In Waco, i35 is the Jack Kultgen Freeway. The campuses of the University of Texas and Baylor University are located adjacent to i35.
Interstate 35 then heads to Hillsboro, where it splits up into i35W and i35E and runs through the Dallas/Fort Worth area. The official mile markers follow i35E through Dallas—i35W, which is 85 miles in length, carries its own mileage from Hillsboro to Denton, as though it were an x35 loop. In Dallas, i35 is the R.L. Thornton Freeway south of i30, which picks up the name heading east. North of i30, it is the Stemmons Freeway.
After passing through Dallas and Fort Worth, i35's two forks merge in Denton. The unified interstate then continues north to Gainesville before crossing the Red River into Oklahoma.
 
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