US DOT established a 1-year pilot program in September 2007 to allow 100 Mexican trucking firms and 100 US trucking firms access to conduct cross-border deliveries in keeping with NAFTA efficiency aims. Independent truckers have fought the program in court from the outset. US DOT just extended the program 2 years to encourage participation.
Background
Allows up to 100 Mexican carriers to operate beyond US border commercial zones
Also up to 100 US carriers to operate throughout Mexico
Only 27 Mexican carriers w/ 107 trucks are operating in the US
Only 10 US carriers w/ 55 trucks are operating in Mexico