U.S. road system question

[Ebony]

I cannot confirm the northern half, but I believe that Interstate 35 runs uninterrupted from Laredo, Texas (terminating fairly close to the Mexico border) to Duluth, Minnesota. It splits into two halves at Hillsboro, Texas, with I-35E going through Dallas and I-35W going through Ft. Worth, but they join back again in the northern end of Denton, Texas (Home of the University of North Texas), and there's no interruption of the road requiring taking a ramp.