This report details (1) the extent to which Mexican-domiciled commercial trucks are likely to travel beyond the U.S. border commercial zones once the border is fully opened, (2) U.S. government agencies' efforts to ensure that Mexican commercial carriers meet U.S. safety and emissions standards, and (3) how Mexican government and private sector efforts contribute to ensuring that Mexican commercial vehicles entering the United States meet U.S. safety and emissions standards. To address these objectives, we met with and obtained documents from a wide variety of officials from the U.S. and Mexican governments and industry representatives.