Crossing ATAL TUNNEL Rohtang - World's Longest Highway Tunnel | Leh-Ladakh Road Trip by Car | EP-2

This is the second Episode of my Road Trip to Leh Ladakh by Car and it started from Bhuntar(Kullu) to Atal Tunnel(Rohtang Tunnel). On 26 September 2021, we started from Bhuntar in the morning and passed through the Atal Tunnel which is the world's longest highway tunnel above 10,000 ft (3000m). In this Atal Tunnel video, I will be telling you some important details about it along with my personal experience in passing from the North Portal to South Portal of the tunnel.

Atal Tunnel today reduces the overall travel time and distance between Manali and Keylong on the way to Leh, this it reduces the time taken from Manali to Leh. Atal Tunnel construction took around 10 years. This Atal Tunnel vlog mentions a lot other details about it. Atal Tunnel in winter is usually less crowded as the snowfall starts in winters. Atal Tunnel Snowfall time starts any time around mid of October and lasts till March or April. So, normally tourists do not prefer to visit Atal Tunnel in December, January, February and March due the extreme cold conditions and snowfall. In this Atal Tunnel latest video, I have tried to share all the positives and negatives of it.

Although there you can watch many Atal Tunnel documentary on YouTube but I have tried to show you my personal experience. Although I could not give Atal Tunnel reaction when it was made by now I have finally come up with it.

This route previously went through Gramphu which was 116 km (72.1 mi) long and took almost 5 to 6 hours in good conditions. You can reach the South Portal of the Atal tunnel from Manali, a distance of 24.4 km (15.2 mi) in around 45 minutes, goes through the distance of 9.02 km (5.6 mi) in about 15 minutes, and reaches Keylong which is 37 km (23.0 mi) away in about 1 hour. The new route via the Atal tunnel brings down the total distance travelled to 71 km (44.1 mi) which can be covered in around 2 hours, which cuts down the time to 3 to 4 hours as compared to the earlier route. Also, the tunnel bypasses a number of sites which were prone to road blockades, avalanches, and traffic snarls.

Atal tunnel is at a total elevation of 3,100 metres (10,171 ft) and the Rohtang Pass is at a total elevation of 3,978 metres (13,051 ft). Atal Tunnel was inaugurated by Prime Minister Narendra Modi on 3 October 2020. The cost of the entire project is ₹3,200 crore (US$438 million).

Specifications: The Atal tunnel is actually intended to create an all-weather route to Leh and Lahaul and Spiti valleys in the state of Himachal Pradesh.

Salient features of the Atal Tunnel are as follows:

Length: 9.02 km (5.6 mi)

Shape (cross-section) of Tunnel: Horseshoe

Finished width: 10.00 m (32.8 ft) at road level. (8m pavement and 1m footpath on both sides)

General altitude of the tunnel: 3,000–3,100 m or 9,840–10,170 ft

Designated vehicular speed: 80 km/h (50 mph)

Geology of tunnelling media: Uniformly dipping alternate sequence of quartzites, quartzitic schists, quartz-diolite-schist with thin bands.

Tunnel boring machines were not used because of the inability to see inside the mountain, instead blasting and digging used to build the tunnel.

Temperature variation in the area: 25–30 °C (77–86 °F) during May–June, −30 to −20 °C (−22 to −4 °F) during Dec–Jan.

Overburden: Maximum 1,900 metres (6,230 ft), average more than 600 m (1,970 ft)
Construction technique: Drill & Blast with NATM

Support system: Fibre-reinforced concrete (100–300mm or 0–10 inch thick) combined with rock bolt (26.50mm dia, 5,000–9,000mm or 200–350 inch long) has been used as the principal support system.

Tunnel ventilation: Semi-transverse system of ventilation.

A 2.25 m high and 3.6 m wide emergency tunnel is integrated in the tunnel cross-section beneath the main carriageway.

The following parameters have been set in design:

(a) Upper tolerance limit for concentration – 150ppm
(b) Visibility factor – 0.009/m
(c) Vehicles
(i) Cars – 3000 Nos.
(ii Trucks – 1500 Nos.
(d) Peak hour traffic – 337.50 PCUs
(e) Design vehicular speed in Tunnel
(i) Maximum Speed – 80 km/h (50 mph)
(ii) Minimum Speed – 30 km/h (19 mph)
Project Cost : Approximately ₹3,200 crore

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Видео Crossing ATAL TUNNEL Rohtang - World's Longest Highway Tunnel | Leh-Ladakh Road Trip by Car | EP-2 канала Anirudh Singh