Although we need more specifics on this story (I poked around NPR's site and Google as well...cant seem to find anything) there was a memo in February that somewhat outlined this.
I did find this
Part of this memo:
Secretary Peters said those Mexican truck companies that may be allowed to participate in the one-year program will all be required to have insurance with a U.S. licensed firm and meet all U.S. safety standards. Companies that meet these standards will be allowed to make international pick up and deliveries only and will not be able to move goods from one U.S. city for delivery to another, haul hazardous materials or transport passengers.
The first Mexican trucks to be authorized under the program will begin traveling beyond U.S. border areas once the initial in-person safety inspections are done and proof-of-insurance verified. Secretary Peters noted that with the announcement of the program, Mexico will begin to consider applications from U.S. trucking firms for licensing rights to operate within Mexico. Approximately 100 U.S. operators would be licensed by Mexico for cross-border operations.
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Now, given illegal aliens can get a US driver's license and US insurance as already being talked about in another thread, who know what this means. Somehow, IMHO, safety and legality will be put on the back burner since our lawmakers dont give a rat's ass about who comes across our border.