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.
Patna
The city is served by several major road highways and state highways, including National Highways 19, 30, 31, and 83. Asia's longest river bridge, the Mahatma Gandhi Setu (built 1982), is located in Patna and connects the city to Hajipur across the Ganga. In recent times, the bridge has been witnessing major traffic chaos and accidents due to exceeding number of vehicles passing over it and regularly overloading the structure. A new six lane road bridge across the Ganges parallel to Mahatma Gandhi Setu is proposed which would connect Kacchi Dargah in Patna City to Bidupur in Vaishali district, which will be the longest bridge in India after completion.