This rulemaking would change FMCSA regulations to govern applications by Mexican carriers to operate beyond municipalities and commercial zones at the United State-Mexico border. It would also revise the application form, OP-1MX, to be filed by these Mexican motor carriers. The revised form would require additional information about the applicant´s business and operating practices to allow the FMCSA to determine if the applicant can meet the safety standards established for operating in interstate commerce in the United States. Carriers that had previously submitted an application would have to submit the updated form. These changes are needed to implement part of the North American Free Trade Agreement (NAFTA). On January 16, 2003, the Ninth Circuit Court remanded this rule, along with two other NAFTA-related rules, to the Agency, requiring a full environmental impact statement and an analysis required by the Clean Air Act. On June 7, 2004, the Supreme Court reversed the Ninth Circuit and remanded the case, holding that FMCSA is not required to prepare the environmental documents as ruled by the Ninth Circuit. FMCSA originally planned to publish a final rule by November 20, 2003.