Pan-American Highway
The Pan-American Highway is a network of roads stretching across the American continents and measuring about in total length. Except for a rainforest break of approximately , called the Darién Gap, the roads link almost all of the Pacific coastal countries of the Americas in a connected highway system. According to "Guinness World Records", the Pan-American Highway is the world's longest "motorable road". However, because of the Darién Gap, it is not possible to cross between South America and Central America with conventional highway vehicles. Without an all-terrain vehicle, it is necessary to circumnavigate this terrestrial stretch by sea.
Trans-Canada Highway
The system was approved by the Trans-Canada Highway Act of 1949, with construction commencing in 1950. The highway officially opened in 1962, and was completed in 1971. Upon its original completion, the Trans-Canada Highway was the most lengthy uninterrupted highway in the world.