"Why do we need this massive system in the middle of the country.....?"
You shouldn't believe what Corsi is writing.
This road is but one of the US High Priority Corridors
While Corsi may call this the NAFTA highway, it isn't. The NAFTA Highway is actually the proposed I 69 from Laredo to Port Huron.
As far as the nation, I 69 is the most important. The TTC 35 that Corsi is talking about is most important to Texas because I 35 is is extremely crowded.
Following the implementation of NAFTA, coalitions of interest have been formed in order to promote specific transport channels, to develop the infrastructures of these channels and to propose jurisdictional amendments to facilitate the crossing of borders. These coalitions include businesses, government agencies, civil organizations, metropolitan areas, rural communities and also individuals, wishing to strengthen the commercial hubs of their regions.
The North American trade corridors are bi- or tri-national channels for which various cross-border interests have grouped together in order to develop or consolidate the infrastructures. The North American corridors are considered multimodal in the sense that they bring into play different modes of transport in succession.
The infrastructures may include roads, highways, transit routes, airports, pipelines, railways and train stations, river canal systems and port facilities, telecommunications networks and teleports.
http://www.fina-nafi.org/eng/integ/corridors.asp?langue=eng#ouest