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Paving at altitude
| 题名： | Paving at altitude |
| 正文语种： | eng |
| 摘要： | A road tunnel stretch that opened for traffic in India in late 2020 is notable for several reasons. The new 9km Atal Tunnel is the world's longest tunnel at an altitude of higher than 3,048m.The tunnel connects the cities of Manali and Keylong and is located in the Himalayan mountain range, cutting the journey time from six or seven hours in the past to just two hours. Previously, the only route was through the dangerous Rohtang pass, which has many switchbacks, is prone to erosion, landslides, and is often covered by snow. The distance between Manali and Teling was 79km but the new tunnel has cut this by 46km. For the first 400m at each of the portals, the speed limit is 40km/h but in the rest of the tunnel length the speed limit is 80km/h, while overtaking is strictly prohibited on safety grounds. |
| 出版年： | 2021 |
| 期刊名称： | World highways |
| 卷： | 30 |
| 期： | 6 |
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