Public transport in Delhi is provided by buses, auto rickshaws and a metro rail system.
Buses are the most popular means of transport catering to about 60% of the total demand. The state-owned Delhi Transport Corporation (DTC) is a major bus service provider for the city. The DTC operates the world's largest fleet of environment-friendly CNG buses. Delhi BRTS is Bus rapid transit serving the city which runs betweenAmbedkar Nagar and Delhi Gate.
The Delhi Metro, a mass rapid transit system built and operated by Delhi Metro Rail Corporation (DMRC), serves many parts of Delhi as well as the satellite city of Gurgaon in the neighbouring Haryana and Noida in neighbouring Uttar Pradesh. As of October 2010, the metro consists of six operational lines with a total length of 153 km (95 mi) and 130 stations while several other lines are under construction. The Phase-I was built at a cost of US$2.3 billion and the Phase-II will cost an additional US$4.3 billion. Phase-II of the network is under construction and will have a total length of 128 km. It is expected to be completed by 2010. Phase-III and IV will be completed by 2015 and 2020 respectively, creating a network spanning 413.8 km, longer than that of the London Underground.
Auto rickshaws are a popular means of public transportation in Delhi, as they charge a lower fare than taxis. Most run on Compressed Natural Gas (CNG) and are yellow and green in colour. Taxis are not an integral part of Delhi public transport, though they are easily available. Private operators operate most taxis, and most neighborhoods have a taxi stand from which taxis can be ordered or picked up. In addition, air-conditioned radio taxis, which can be ordered by calling a central number, have become increasingly popular, charging a flat rate of 15 per kilometre.
Delhi is a major junction in the rail map of India and is the headquarters of the Northern Railway. The five main railway stations are New Delhi Railway Station, Old Delhi,Nizamuddin Railway Station, Anand Vihar Railway Terminal and Sarai Rohilla. Delhi is connected to other cities through many highways and expressways. Delhi currently has three expressways and three are under construction to connect it with its prosperous and commercial suburbs. The Delhi-Gurgaon Expressway connects Delhi with Gurgaon and the international airport. The DND Flyway and Noida-Greater Noida Expressway connect Delhi with two prosperous suburbs of Noida and Greater Noida.
Indira Gandhi International Airport (DEL) is situated in the western corner of Delhi and serves as the main gateway for the city's domestic and international civilian air traffic. In 2006–07, the airport recorded a traffic of more than 23 million passengers, making it one of the busiest airports in South Asia. A new US$1.93 billion Terminal 3 handles an additional 34 million passengers annually in 2010. Further expansion programs will allow the airport to handle more than 100 million passengers per annum by 2020.
Private vehicles account for 30% of the total demand for transport. At 1922.32 km of road length per 100 km², Delhi has one of the highest road densities in India.Delhi is well connected to other parts of India by five National Highways: NH 1, 2, 8, 10 and 24. Roads in Delhi are maintained by MCD (Municipal Corporation of Delhi), NDMC, Delhi Cantonment Board, Public Works Department (PWD) and Delhi Development Authority.
Delhi's high population growth rate, coupled with high economic growth rate has resulted in an ever increasing demand for transport creating excessive pressure on the city's existent transport infrastructure. As of 2008. Also, the number of vehicles in the metropolitan region, i.e., Delhi NCR is 112 lakhs (11.2 million). In 2008, there were 85 cars in Delhi for every 1,000 of its residents. In order to meet the transport demand in Delhi, the State and Union government started the construction of a mass rapid transit system, including the Delhi Metro. In 1998, the Supreme Court of India ordered all public transport vehicles of Delhi to use compressed natural gas (CNG) as fuel instead of diesel and other hydro-carbons.
Northern Peripheral Road
Northern Peripheral Road road is being developed under the public private partnership (PPP) model. This stretch will connect Dwarka with National Highway 8 at Kherki Dhaula and will pass Pataudi Road. The NPR stretch has been planned as an alternate link road between Delhi and Gurgaon, and is expected to ease the traffic situation on the Delhi-Gurgaon Expressway. The road will also provide connectivity to the much-touted Reliance-HSIIDC SEZ besides the Garhi Harsaru dry depot.
Much like Delhi, Gurgaon too will have a BRT corridor to decongest traffic on the Northern Peripheral Road .In several sections, the NPR will have provisions for the BusRapid Transit (BRT) corridor to ensure smooth flow. The road will be fully developed in march 2012.