The roadway network in Mexico is extensive and all areas in the country are covered by it.The roadway network in Mexico has an extent of 366,095 km (227,481 mi),of which 116,802 km (72,577 mi) are paved, making it the largest paved-roadway network in Latin America.Of these, 10,474 km (6,508 mi) are multi-lane expressways: 9,544 km (5,930 mi) are four-lane highways and the rest have 6 or more lanes. The highway network in Mexico is classified by number of lanes and type of access. The great majority of the network is composed of undivided or divided two-lane highways—with or without shoulders, and are known simply as carreteras. Four or more-lane freeways or expressways, with restricted or unrestricted access are known as autopistas. Speed limits in two-lane highways can vary depending on terrain conditions. The speed limit in multi-lane freeways or expressways is on average 110 km/h (70 mph) for automobiles and 95 km/h (60 mph) for buses and trucks. Mexico privatized its rail service with the dissolution of the former Ferrocarriles Nacionales de México in 1998. There is a Mexico City Metro and a Monterrey Metro as well as light rail systems operating in Mexico City (Xochimilco Light Rail), and Guadalajara (Guadalajara light rail system). The Secretariat of Communications and Transport of Mexico has proposed a high-speed rail link that would transportation passengers from Mexico City to Guadalajara, Jalisco, with stops in the cities of Querétaro, Guanajuato, Leon and Irapuato; and a connected line running from the port city of Manzanillo to Aguascalientes. The train, which would travel at 300 km/h, allows passengers to travel from Mexico City to Guadalajara in just 2 hours (the same trip by road would last 7 hours).