The first link on that site is to NASCO who, on their own website, says no less than four times in their FAQ that there is no plan for a "superhighway" like the Humanevents site portrays.
NASCO wrote:
Will the NAFTA Superhighway be four football fields wide?
There is no new, proposed “NAFTA Superhighway.â€
As of late, there has been much media attention given to the "new, proposed NAFTA Superhighway". NASCO and the cities, counties, states and provinces along our existing Interstate Highways 35/29/94 (the NASCO Corridor) have been referring to I-35 as the 'NAFTA Superhighway' for many years, as I-35 already carries a substantial amount of international trade with Mexico, the United States and Canada. There are no plans to build a new, “NAFTA Superhighway†- it exists today as I-35.
[...]
Is the map on the website an approved plan for the proposed NAFTA Superhighway?
There is no proposed NAFTA Superhighway. The map is not a plan or blueprint of any kind. The infrastructure depicted on the map is not drawn to scale. The highways shown on the map exist today, and have been enlarged to highlight the NASCO Corridor focus area. They are EXISTING highways I-35, I-29 and I-94 (the NASCO Corridor) in the United States, and existing highways connecting to them
in Canada and Mexico
[...]
The Trans Texas Corridor is the first section of the proposed, new NAFTA Superhighway…
There is no proposed, new NAFTA Superhighway. The Trans Texas Corridor is a Texas Department of Transportation initiative proposed to solve critical
transportation problems in the State of Texas. NASCO supports the TTC-35 (to parallel Interstate 35) section of the proposed TTC because it is directly related to, and will benefit, existing I-35, which is the NASCO Corridor. We have no authority over this initiative and know of no plans to extend it to other states.
[...]
Your mission seems to indicate you are building something new...
Our mission is to develop (NOT BUILD) the world’s first international,integrated and secure, multimodaltransportation system along the International Mid-Continent Trade and Transportation Corridor to improve both the trade competitiveness and quality of life in North America. Out of EXISTING infrastructure.
I'm not sure why Humanevents would even include such a link as "evidence".