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.
Himachal Road Transport Corporation
Other than regular services connecting Himachal to Chandigarh, Delhi and Haridwar; HRTC operates buses on some of the highest motorable roads in the world. These routes include Leh-Delhi, Shimla-Kaza, Kullu-Kaza, Manali - Reckongpeo and others. The Leh-Delhi routes operated by HRTC is 1203 km long and is the longest route by any RTC in India with a travel time of approx. 35 hours. The roads to Kaza are also termed as the world's most treacherous roads.