In big chunks of Texas, interstates don't have medians - they have concrete barriers.
But, no, they aren't talking about the interstates. The article does make clear they are talking about the TTC. "Those involved in the project envision it setting up along the proposed Trans-Texas Corridor 69"
Corridor 69? What an unfortunate choice of numbers.
OTOH, it’s a perfect statement of the relationship between the government and corporate interests in this project.