Mexico's land transportation network is one of the most extensive in Latin America. More than 4,000 km (2,400 mi.) of four-lane highway have been built through government concessions to private sector contractors since 1989, of which 3,500 km (2,100 mi.) have been constructed since 1994. The vast majority of these expressways are toll roads. Juarez, Mexico is located directly across the Rio Grande River from El Paso, Texas which is located on the western tip of Texas, approximately halfway between the Gulf of Mexico and the Pacific Ocean. This metroplex is ideally located to serve the United States, Canada, and Latin America. The El Paso / Juarez / Southern New Mexico Region is serviced by three US major highway systems of I-10, I-54, and I-25. It is also serviced by Mexican Highway 45 (the Pan American Highway) which runs from Juarez to Mexico City.