Is the U.S. using the issue of truck safety as a trade barrier to Mexico?

1. Is the U.S. using the issue of truck safety as a trade barrier? What proof can you offer? I think U.S. is using the issue of truck safety as a trade barrier because the increase in Mexican trucks within the limited border zone has had an adverse affect on safety in the U.S. For example, in Texas border counties, within the commercial border zone, have seen a dramatic increase in highway fatalities …

…seven years to fulfill its commitments to enact and enforce a truck safety program that would ensure that the Mexican trucks seeking access to U.S. highways meet U.S. safety standards. The implication, unfortunately, is that Mexicans are simply incapable of getting their trucking operations up to U.S. standards. Reference: http://www.wsws.org/articles/2001/aug2001/mex-a02.shtml http://www.citizen.org/publications/release.cfm?ID=6839 http://www.ttnews.com/members/printEdition/0004366.html