The North–South–East–West Corridor (NS-EW) is the largest ongoing highway project in India. It is the second phase of the National Highways Development Project (NHDP), and consists of building 7300 kilometers of four/six lane highways associating Srinagar, Kanyakumari, Kochi, Porbandar and Silchar, at a cost of US$12.317 billion (at 1999 prices). , 6875 of the 7142 kilometers project has been finished. But In Salem to Kochi stretch of Tamilnadu state the road is not yet 4 lane. It also have 12 feet narrow bridge at Madhukkarai taluk of Coimbatore. In combination with the Golden Quadrilateral network, and port connectivity highways, the NS-EW Corridor forms a key part of the Indian highway network, connecting many of its important manufacturing, commerce and cultural centers. As of May 2012, India has completed and placed in use some 15,800 kilometers of such 4-lane highways. The NS–EW project is managed by the National Highways Authority of India under the Ministry of Road Transport and Highways. Route Only National Highways are used in the two corridors. North–South Corridor This is a corridor via NH 44 (Srinagar-Udhampur-pot Jammu–Jalandhar–Delhi–Agra–Gwalior–Jhansi–Sagar–Narsinghpur-Lakhnadon–Nagpur-Hyderabad-Chikkaballapur-Bengaluru-Salem–Madurai-Kanyakumari), branch road NH 544 (Salem–Coimbatore–Palakkad-Kochi) East-West Corridor This is a corridor via NH 27 (Porbandar–Rajkot-Samakhiali–Radhanpur–Kota–Jhansi–Kanpur-Lucknow–Ayodhya-Gorakhpur-Muzaffarpur–Darbhanga-Supaul-Purnia– Dalkhola-Kishanganj, Islampur–Sonapur- Ghoshpukur-Jalpaiguri Alipurduar- Bongaigaon - Nalbari Bijni–Guwahati–Nagaon–Dabaka–Silchar). Interchange points between the corridors The following is an interchange section Jhansi is the junction of North–South and East–West Corridors. The following stretches are common between the Golden Quadrilateral and the NS-EW Corridors. Delhi–Agra: Golden Quadrilateral & North–South Corridor Bengaluru–Krishnagiri: Golden Quadrilateral & North–South Corridor Akbarpur–Kanpur: Golden Quadrilateral & East–West Corridor Udaipur–Chittorgarh: Golden Quadrilateral & East West Corridor The following is a Spur Highway of the North–South Corridor Kochi–Coimbatore–Salem(NH 544): North–South Corridor & North–South Corridor Extension Major cities Possible extensions There is popular demand for the extension of the East West Corridor from Silchar to Moreh via Jiribam and Imphal, and from Nagaon to Stilwell Road via Jorhat, Dibrugarh, Tinsukia and Ledo. These two extensions may increase the cross border trade with South East Asia. Current status Chainage Chart of Corridor North – South Chainage Chart of Corridor East – West Gallery See also Similar rail development Future of rail transport in India, rail development Similar roads development Bharatmala Diamond Quadrilateral, Subsumed in Bharatmala Golden Quadrilateral, completed national road development connectivity older scheme National Highways Development Project, Subsumed in Bharatmala India-China Border Roads, Subsumed in Bharatmala Expressways of India Setu Bharatam, river road bridge development in India