The U.S. plan to equip Mexican trucks with electronic recorders for driver logs would be a limited, temporary program undertaken because it is the only way the Federal Motor Carrier Safety Administration (FCMSA) can ensure that the Mexican trucks will be monitored, the U.S. government says; under (NAFTA), the United States cannot require Mexican carriers to do anything that U.S. carriers are not required to do, but the government still must provide a way to monitor Mexican carriers for compliance with both the hours of service rules and the cabotage rules that restrict freight hauling between points in the United States