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As the third largest and second most populous country in Latin America, Mexico has developed an extensive transportation network to meet the needs of the economy. As with communications, transportation in Mexico is regulated by the Secretariat of Communications and Transportation, (''Secretaría de Comunicaciones y Transportes'', SCT) a federal executive cabinet branch. ==Roadways== (詳細はMexico Infrastructure, power and Communications ). National Economies Encyclopedia. Retrieved on 13 January 2007〕 The roadway network in Mexico has an extent of ,〔(CIA - The World Factbook ). CIA World Factbook. Retrieved on 20 December 2010〕 of which are paved,〔(Infraestructura Carretera ). Secretaría de Comunicaciones y Transportes. México. Retrieved on 13 January 2007〕 making it the largest paved-roadway network in Latin America.〔With data from The World Factbook〕 Of these, are multi-lane expressways: 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. The expressways are, for the most part, toll roads or ''autopistas de cuota''. (Non-toll roads are referred to as ''carreteras libres'', or free-roads). Most toll expressways have emergency telephone booths, water wells and emergency braking ramps at short intervals. The toll usually includes a "travelers' insurance" (''seguro del viajero'') should an accident occur within the freeway.〔(Seguro de Viajero en Carreteras Federales ). November 2004. Retrieved on 13 January 2007〕〔(Toll Roads and Driving in Mexico. ) Mexperience.com. Retrieved on 13 January 2007.〕 The tolls are, on average, among the most expensive in the world, according to a comparative study realized in 2004 by the Chamber of Deputies.〔(México, aún con las autopistas más caras ). El Siglo de Torreón. 8 May 2006. Accessed on 13 January 2008.〕 The most traveled freeways are those that link the three most populous cities in Mexico—Mexico City, Guadalajara and Monterrey—in the form of a triangle.〔 No federal freeway or expressway crosses a city; toll expressways are either turned into toll bypasses (''libramientos'') often used as toll or free ring roads (''periféricos''), or are transformed into major arterial roads, even if they are, in function, freeways with restricted access. Mexican highways are assigned a one to three-digit number. North-south highways are assigned odd numbers whereas east-west highways are assigned even numbers. Toll expressways usually run parallel to a free road, and therefore, are assigned the same number with the letter "D" added. (For example, the undivided two-lane highway connecting Mexico City and Puebla is MX 150, whereas the six-lane toll expressway is MX 150D). Mexico has had difficulty in building an integrated highway network due to the country's orography and landscape characteristics〔(Transportations and Telecommunications ). Mexico. Encyclopædia Britannica. Retrieved on 14 January 2008〕—most of the country is crossed by high-altitude ranges of mountains. Over the last two decades, Mexico has made impressive investments in order to improve its road infrastructure and connect main cities and towns across the country.〔(Guide to Toll Roads in Mexico ). Toll Roads and Driving in Mexico. Mexperience.com. Retrieved on 13 January 2007.〕 In spite of its extension and recent development, the roadway network in Mexico is still inadequate to meet the current needs of the population and, except for the toll roads,〔(The Development of Mexico's Road Network ). Getting Around in Mexico. Mexperience. Retrieved on 13 January 2007.〕 they are often not adequately maintained.〔 An additional problem is that in the center of the country the roads run into metropolitan Mexico City from regional centers and there are few roads which run peripherically so as to connect the other regional centers without running through the congestion around the capital. The federal government (in partnership with the government of Mexico State and the Federal District) has tried to alleviate this problem by constructing a tolled Mexico City bypass highway, named "Arco Norte," partially opened in 2009.〔(Arco Norte web site ) Retrieved 25 August 2010〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Transportation in Mexico」の詳細全文を読む スポンサード リンク
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