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.
Limited-access road
Singaporean expressways are used to get to one urban place to another. The longest is the Pan Island Expressway, which covers the width of Singapore. It is 42 kilometres long. Since 2009, even more expressways are being constructed. One of the newest is the Kallang-Paya Lebar Expressway which is 2 kilometres on ground level and 10 kilometres underground. That makes it the longest tunnel expressway in Southeast Asia. On ground level or on flyovers and viaducts, speed limits is 70 km/h to 90 km/h but in tunnels, the speed limit is 70 km/h or 80 km/h.