The proposed I-27 Ports to Plains Corridor extends north from Amarillo to Ramon New Mexico and south from Lubbock to Big Spring, San Angelo, Del Rio, and I-35 north of Laredo.
I-31 to Dumas
The proposed I-31 connects to the I-27 Ports to Plains Corridor at Dumas then north along U.S. 54 Oklahoma and Kansas.
I-31 to San Angelo
The proposed I-31 connects to the I-27 Ports to Plains Corridor at San Angelo.
I-18 continues to Jasper, then follow TX 63 and US 69 to Lufkin and Jacksonville. From Jacksonville, I-18 follows US 175 to Dallas Texas where it uses the existing US 175 Hawn Freeway into Dallas to terminate at I-45 in Dallas.
The new I-14 Central Texas Corridor follows the US 190 corridor from TX 63 near Jaspar to Hunstville, Bryan, Killeen as studied in 2011. The Central Texas Corridor created in the FAST Act has branch Interstate corridors to Midland, Sonora, and along US 190 to Madisonville with feeder corridors to Beaumont and Corpus Christi. Assuming the mainline corridor for I-14 goes to Midland, then the branch to Sonora could be I-114, and the branch to Madisonville could become I-314. I-14 is also the assumed designation for the 14th Amendment Highway from Natchez Mississippi through Alabama to Augusta Georgia. While Texas is actively planning to build I-14, both Louisiana and Mississippi have withdrawn support for the Gulf Coast Strategic Highway connecting Alexandria Louisiana and Natchez Mississippi. Planning for the 14th Amendment Highway is also at a stand still in Mississippi, Alabama, and Georgia. A conceptual Interstate corridor along US 79 to Austin could be either I-314 or I-214.