Pan-American Highway

The Alaska Highway through Alaska, Yukon and British Columbia is commonly considered a de facto northerly extension of the Pan-American Highway, as is the Dalton Highway in Alaska. In Canada, no particular road has been officially designated as the Pan-American Highway. The National Highway System, which includes but is not limited to the Trans-Canada Highway, is the country's only official inter-provincial highway system. However, several Canadian highways are a natural extension of several key American highways that reach the Canada–US border. British Columbia Highway 97 and Highway 2 to Alberta both pick up where the southern end of the Alaska highway leaves off. Highway 97 becomes U.S. Route 97 at the Canada–US border. British Columbia Highway 99 provides an alternate route from Highway 97 just north of Cache Creek; it runs through Whistler and Vancouver before ending at the Canada–US border at the north end of Interstate 5 in Washington state, the beginning of the official Pan-American route south of British Columbia. Meanwhile, Alberta Highway 2 runs south and east to Alberta Highway 3 leading into Lethbridge, then south on Alberta Highway 4 to the Canada–US border, where it becomes Interstate 15 in Montana. This is the first official stretch of the Pan-American Highway south of the Alberta route, both of which are also part of the CANAMEX Corridor.

In 1966, the U.S. Federal Highway Administration designated the entire Interstate Highway System as part of the Pan-American Highway System,[9][10] but this has not been expressed in any of the official interstate signage. Of the many freeways that make up this very comprehensive system, several are notable because of their mainly north–south orientation and their links to the main Mexican route and its spurs, as well as to key routes in Canada that link to the Alaska Highway.

These include the following:

• Interstate 5 runs north from San Diego, California, to Blaine, Washington, then links indirectly with British Columbia Highway 99 north of the Canada–US border. A technically direct link between the same interstate and the U.S. Route 97 system can be found near Weed, California. US Route 97 runs northeast then north through Oregon and Washington from this junction, and becomes BC Highway 97 at the border with Canada.
• Interstate 15 links San Diego with Alberta Highway 2 that eventually crosses into British Columbia and ends at the southern terminus of the Alaska Highway. Interstate 8 provides an east–west link from San Diego to Interstate 10 near Phoenix, Arizona. The latter continues to Tucson and links with Interstate 19, which becomes a spur of the Pan-American highway through Mexico at the Nogales border crossing.
• Interstate 25 runs north from Interstate 10 at Las Cruces, New Mexico, to Interstate 90 in Wyoming. This route has no direct extension into Canada but links indirectly to Interstate 15. Interstate 25 in Albuquerque, New Mexico, was named the Pan-American Freeway,[11]^: 248 as an extension of Highway 45, the Mexican spur linking El Paso to the original route along highway 85 north of Mexico City.[12] This portion of I-25 largely follows the historic Camino Real, and thus serves a culturally significant portion of the Pan American system. Like I-15, the complete route of Interstate 25 is an official northerly continuation toward Alberta, where Highway 2 provides a direct but unofficial Canadian link to the Alaska Highway.
• Interstate 35 is a northerly continuation of the original Pan-American highway following Mexican Federal Highway 85. It extends from Laredo, Texas to the Canada–United States border north of Duluth, Minnesota, with a spur, Interstate 29, that leads farther west toward Winnipeg, Manitoba. The section of Interstate 35 in San Antonio, Texas is referred to as the Pan Am Expressway by locals. I-35 is a northerly continuation of Mexico Highway 85, the original official Mexican route, ending in Duluth, Minnesota, where Minnesota State Highway 61 continues to the Canada–US border near Thunder Bay, Ontario. The Trans-Canada Highway provides a link from Winnipeg and Thunder Bay to Alberta and the Alaska Highway, but it is not officially part of the Pan-American Highway.
• An additional route only partially complete is Interstate 69, which will eventually run northeasterly from the same Laredo border crossing to the Windsor-Quebec City Corridor in Canada, where the route becomes unofficial.

Several North American routes have names that make no direct reference to the Pan-American Highway, in part because some sections follow highways that are not up to full freeway standard.

• The CANAMEX Corridor is designated from Mexico City to the western United States from Arizona to Montana,[13] and continues north into western Canada. Although lacking any official status for the Pan American Highway in Canada, this is the only official North American highway that runs through Canada, the U.S., and Mexico to link the Alaska Highway with the Pan-American Highway at Mexico City. Unlike corresponding Pan American routes in the American southwest, the Canamex Highway bypasses San Diego by using several non-interstate highways to provide a shortcut from I-15 at Las Vegas, Nevada to I-10 at Phoenix, Arizona for traffic accessing I-15 from the Nogales border crossing.
• The CanAm Highway follows Interstate 25 from El Paso to U.S. Route 85 north of Denver, Colorado, then continues into the Canadian province of Saskatchewan, following parts of provincial highways 35, 39, 6, 3, and 2 in succession before terminating at La Ronge. This route was first proposed during the 1920s but was never properly promoted nor developed. A section of the CanAm in southern Saskatchewan has deteriorated to the point where it is no longer a paved highway.[14]
• The NAFTA Superhighway tag has been unofficially used in connection with Interstate 35 from Laredo, Texas to the Canadian border; there it downgrades to a non-freeway route ending at Thunder Bay, Ontario. A spur follows Interstate 29 to the border, where it also downgrades to an arterial highway that extends to Winnipeg, Manitoba. The NAFTA highway sometimes unofficially includes Interstate 69, which is mostly complete from western Kentucky to the Canada–US border at Port Huron, Michigan. In Canada, Ontario Highway 402 and other freeways in the Windsor-Quebec City Corridor can be considered a northeastward extension of this version of the NAFTA superhighway. To the southwest, from western Kentucky to the Mexican border, there is no single superhighway yet completed. Pending completion of I-69, the main highway links to Mexico follow parts of US routes 45 and 51 from Kentucky to western Tennessee, I-155 into Missouri, parts of Interstates 55 and 40 from Missouri to Arkansas, and I-30 to the Texas stretch of I-35 that continues to the Mexican border at Laredo, Texas. The section of I-69 to be completed south of Kentucky is expected eventually to continue southwestward to the Texas Gulf Coast. It will have a spur linking to the original Pan-American route through Mexico to Laredo, and additional branches extending to the Mexican spurs that cross the border at Pharr, Texas, and Brownsville, Texas.

1933 map of the Inter-American Highway portion of the Pan-American Highway.

The official route of the Pan-American Highway through Mexico (where it is known as the Inter-American Highway) starts at Nuevo Laredo, Tamaulipas (opposite Laredo, Texas), and goes south to Mexico City along Mexican Federal Highway 85. Later branches were built to the border as follows:

• Nogales spur – Mexican Federal Highway 15 from Mexico City
• El Paso spur – Mexican Federal Highway 45 from Highway 85 north of Mexico City to Ciudad Juárez, Chihuahua
• Eagle Pass spur – unknown, possibly Mexican Federal Highway 57 from Mexico City to Piedras Negras, Coahuila
• Pharr spur – Mexican Federal Highway 40 from Monterrey to Reynosa, Tamaulipas
• Brownsville spur – Mexican Federal Highway 101 from Ciudad Victoria to Matamoros, Tamaulipas

From Mexico City to the border with Guatemala, the highway follows Mexican Federal Highway 190.[15][16][17] In the inaugural Carrera Panamericana road race, organized by the Mexican government, the terminus of this southern route was said to be at Ciudad Cuauhtémoc, Chiapas, at the Guatemalan border.[18]

Pan-American Highway in Chimaltenango (Guatemala), 2015.

Pan-American Highway at David, Chiriquí

The Pan-American (or Inter-American) highway passes through the Central American countries with the highway designation of CA-1 (Central American Highway 1). Belize was supposedly included in the route at one time, after it switched to driving on the right. Prior to independence, as British Honduras, it was the only Central American country to drive on the left side of the road.

In Guatemala, it passes through 10 departments, including The Department Of Guatemala, where it passes through Guatemala City.

In El Salvador, it passes through the cities of Santa Ana, Santa Tecla, Antiguo Cuscatlán, San Salvador, San Martín, San Miguel, and crosses the border into Honduras at Amatillo and crosses through Choluteca.

From Honduras, it passes into Nicaragua at El Espino, passing through the Nicaraguan cities of Somoto, Estelí, Sebaco, Managua, Jinotepe, and Rivas before entering Costa Rica at Peñas Blancas.

In Costa Rica, the Pan-American Highway is known as Carretera Interamericana (Inter-American Highway) and is composed of two segments Carretera Interamericana Norte (Route 1) and Carretera Interamericana Sur (Route 2).

It passes through Liberia, San José, Cartago, Pérez Zeledón, Palmares, Neily, before crossing into Panama at Paso Canoas.

The highest point in the entire Pan-American Highway occurs at the Cerro de la Muerte (Death Hill) in the Carretera Interamericana Sur segment, at 3,335 m (10,942 ft).

An alternative route used by cross country buses and freight transportation that avoids crossing through the Greater Metropolitan Area and Cerro de la Muerte, is by taking Route 23 in Puntarenas canton from Route 1, then Route 27 and Route 34, and taking Route 2 in Osa canton.

In Panama, it crosses the Panama Canal via the Centennial Bridge, and the pavement ends at Yaviza, at the edge of the Darién Gap: it is now being extended 6 km. to Pinogana, which will include a bridge over the Chucunaque River[19]. The road had formerly ended at Cañita, Panama, 180 km (110 mi) north of its current end. United States government funding was particularly significant to complete the high-level Bridge of the Americas over the Panama Canal, during the years when the canal was administered by the United States.

The southern part of the highway begins in Turbo, Colombia, from where it follows Colombia Highway 62 to Medellín. At Medellín, Colombia Highway 56 leads to Bogotá, but Colombia Highway 25 turns south for a more direct route. Colombia Highway 40 is routed southwest from Bogotá to join Highway 25 at Zarzal. Highway 25 continues all the way to the border with Ecuador.

Another route, known as the Simón Bolívar Highway, runs from Bogotá (Colombia) to La Guaira (Venezuela). It begins by using Colombia Highways 55 & 66 all the way to the border with Venezuela. From there it uses Venezuela Highway 1 to Caracas and Venezuela Highway 9 to its end at La Guaira.

Monument on the Equator on the highway near Cayambe, Ecuador.

Ecuador Highway 35 runs the whole length of the country. Peru Highway 1 carries the Pan-American Highway all the way through Peru to the border with Chile.

In Chile, the highway follows Chile Route 5 south to (Llaillay), a point north of Santiago, where the highway splits into two parts, one of which goes through Chilean territory to Puerto Montt, where it splits again, to Quellón on Chiloé Island, and to its continuation as the Carretera Austral. The other part goes east along Chile Route 60, which goes through the Andes to the Christ the Redeemer Tunnel, inside the Los Libertadores Pass. The Chilean-Argentinian border is located in the middle of the tunnel.

Almost all Pan-American sections in Gran Buenos Aires are modern highways

West Access to Buenos Aires

Stretch of the Pan-American Highway in Argentina

In Argentina, the Argentina National Route 7 starts in the Christ the Redeemer tunnel, and continues to Buenos Aires, the end of the main highway.[27] The highway network also continues south of Buenos Aires along Argentina National Route 3 towards the city of Ushuaia in Tierra del Fuego. Another branch, from Buenos Aires to Asunción in Paraguay, heads out of Buenos Aires on Argentina National Route 9. It switches to Argentina National Route 11 at Rosario, which crosses the border with Paraguay right at Asunción. Other branches probably exist across the center of South America.

A continuation of the Pan-American Highway to the Brazilian cities of São Paulo and Rio de Janeiro uses a ferry from Buenos Aires to Colonia in Uruguay and Uruguay Highway 1 to Montevideo. Uruguay Highway 9 and Brazil Highway 471 route to near Pelotas, from where Brazil Highway 116 leads to Brazilian main cities.

The highway does not have official segments to Belize, Guyana, Suriname (there known in Dutch: Pan-Amerikaanse weg) and French Guiana, nor to any of the island nations in the Americas. However, highways from Venezuela link to Brazilian Trans-Amazonian highway that provides a southwest entrance to Guyana, route to the coast, and follow a coastal route through Suriname to French Guiana.