Tell about PAN American Highway ?

The Dalton Highway was constructed in 1974 as a supply road to support the Trans-Alaska Pipeline System.

It is a challenging drive, with no services of any kind on one 384 kilometre (240 mile) stretch, and was the first road to be featured in the BBC’s World’s Most Dangerous Roads.

The first rule of bus travel in Latin America: always choose the best class of vehicle you can afford. There's usually a wide range, from comfortable to condemned. In Nicaragua, however, one size fits all. Just.

From Fairbanks there is a 155 kilometre (96 mile) link to Delta Junction at the northern end of the Alaska Highway, the next part of the route.

the First Pan-American Conference in 1889 as a railroad; however, this proposal was never realized. The idea of building a highway emerged at the Fifth International Conference of American States in 1923.

The highway itself is the world's longest thoroughfare, at 15,000 miles, but has an identity crisis. You know where you are with, say, the M6 or Highway One along the Californian coast. These impressive pieces of transport infrastructure are clearly defined, and are difficult to muddle with one another, or other, lesser roads. The Pan-American Highway is different. For much of its length, it is an anonymous string of freeways and main streets.

The Alaska Highway was constructed in 1942 by the US Army Corps of Engineers, as a wartime project using around 10,000 troops.

The first conference regarding construction of the highway occurred on October 5, 1925. Finally, on July 29, 1937, Argentina, Bolivia, Chile, Colombia, Costa Rica, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama, Peru, Canada, and the United States signed the Convention on the Pan-American Highway

Once the Pan-American snakes south from Mexico into Guatemala, though, it acquires a proper identity. Threading through the volcanic scars on the waist of the Americas, the highway adopts the name Carretera Panamericana, and serves as Central America's main street.

Its purpose was to link Alaska with the 48 contiguous states through Canada to help defend against a possible Japanese attack.

The Pan-American Highway is more publicly embraced in Latin American countries than in North America.

It was originally around 2,700 kilometres long but as of 2012 had been shortened to 2,232 kilometres (1,387 miles) and is now paved over its entire length.

During your trip down the Pan-American Highway, you should take a turn along some of the ribs that project from the spine of Central America. The most enticing side-trip is to Lake Nicaragua, which rivals entire Central American countries for size. Roll off the highway at the turn to San Jorge, and you can roll on to a ferry and cross the lake to the largest of its 300 islands: Ometepe. In the language of the original inhabitants, ome means two and tepe means hills.

You can imagine the terrain. The pair of unmatching volcanoes, known as Concepcion and Maderas, were joined two centuries ago by the lava flow. In the mornings, both peaks tend to be hidden beneath a blanket of cloud, but by afternoon, the view should be clear.

A few miles on, you face the biggest aggravation of the Pan-American Highway: crossing a border. Now, you might think that a frontier is simply somewhere to cross a line between nations. But in Central America, it constitutes an almost limitless job-creation scheme. Between Nicaragua and Costa Rica, for example, first you pay $1 for the benefit of the local mayor.

The Nicaragua frontier post and the entrance to Costa Rica are so far apart that most pedestrians pay another couple of dollars for a handcart to take their luggage halfway, and then - in more affluent Costa Rica - a transfer to a golf buggy that goes the rest of the way.

In Costa Rica's capital, the present Pan-American Highway wriggles through a chicane of homes, factories and once-grand public buildings.

Sleeping alongside the present Pan-American Highway can prove tricky; as well as the noise, the average motel is devoid of class, cleanliness or charm. Thankfully, Costa Rica saves its best until the frontier.

The hills near the Panamanian border are alive with the sound of Austrian cash pouring in, to fund the Esquinas Rainforest Lodge, a hotel that, for once, deserves the prefix "eco-". The cabins are built from fallen trees, the roofs are thatched with palm and there's no air-conditioning.

They, and the rest of the world, have converged on Panama City. Your ride through Central America reaches its penultimate cadence where the Bridge of the Americas straddles the Pacific mouth of the Panama Canal, then plunges into the capital. Panama City itself bombards your emotions with a blaze of colour, scattered fragments of the past and a location that teeters on the brink of the world's biggest ocean.