The Delhi–Saharanpur–Dehradun Expressway, also known as National Highway 709B (NH 709B),[2][3] is an under-construction, 210 kilometres (130 mi) long, 12/6 lane access-controlled expressway, which will connect Delhi, the national capital of India, with Dehradun, the capital of the Indian state of Uttarakhand.

[4][5][6][7][8] The National Highway 307 (NH-307) is also part of the Delhi Dehradun Expressway.

[9] It will have two spurs, or link roads, to ensure connectivity with cities lying nearby to its route: one 50.7-kilometre-long (31.5 mi), six-lane Saharanpur–Roorkee–Haridwar Expressway, and another 121-kilometre-long (75 mi), six-lane Ambala-Shamli Expressway.

[12] A 12-kilometre-long (7.5 mi) elevated corridor will be constructed over the Rajaji National Park to protect wildlife, thus it will be the second highway in India to have a wildlife protection corridor after NH-44.

After completion of this expressway, the distance between the two cities would be reduced from 250 kilometres (160 mi) to 210 kilometres (130 mi), while journey time would be reduced from 5 hours to only 2.5 hours.