I just called downstairs to the Mrs. (who wrote the article last year). She says the Mexican driver thing was a non-legislated "regulation" allowing Mexicans to drive across the border; it had nothing to do with the treaty. I was wrong.
The effect is the same. They're a'comin'...
I lost track of the issue since, but the Supreme Court ruling allows Mexican trucks into the interior of the U.S. That is still a far cry from performing the same task as our gypsy independents. The various special-interest groups aligned against the issue were the unions and the Greens. I remember being bombarded in 2004 with their propaganda in the press ("allowed to operate," sounds sinister doesn't it?--Mexicans will be doing the Detroit-Chicago run!). Don't fall for it.