Delhi by its variety, congestion, and large expanse is a transportation challenge. Delhi, however, has an advantage in terms of good infrastructure in the form of wide roads and decent railway and air connectivity.

Roadways
As Delhi's population continues to increase at an exponential rate, the city's transportation authority is struggling to reduce traffic congestion problems. Delhi's state Government initiated a massive traffic decongestion plan on the late 1990s investing billions of dollars in the city's road transport system. Today, there are more flyovers and highways in Delhi than in all other Indian metropolitan cities combined. The city's transportation system is regarded as the best in India. The Government's modest efforts have also helped reduce pollution level in the city.

Road connectivity is mostly reliant on private vehicles. Delhi has the highest ratio of vehicles per capita in India. Government-Owned Delhi Transport Corporation buses, and private buses, including chartered buses, White-line buses and Yellow-line buses also play a crucial role on connecting Delhi.

Auto-rickshaws
The auto rickshaws (sometimes shortened to Auto) form a very important mean of public transportation in Delhi as they charge a lower fare compared to Taxis. Hiring an Auto in Delhi is very tricky as not many auto-drivers accept the standard meter charges.

The typical method is to negotiate and haggle for an agreeable rate. It is also typical for the rate to be almost doubled after 11 p.m. at night. With the introduction of electronic meters, the tamperability of meters has been reduced, and a stronger jurisdiction for a sanctioning body has forced more autorickshaws to comply with the meter-based charging scheme.

Buses
Delhi has one of India's largest Bus transport systems. Most of the Buses which ply across Delhi are operated by State-owned Delhi Transport Corporation (DTC) and other private operators such as the BlueLine Transport Corporation. It is mandatory for all private bus operators to acquire permit from Delhi's State Transport Authority.

The fares in buses are based on the colour of the stripe on the bus. Regular DTC buses which are yellow in colour and have bus numbers in white plates. These buses have fares of denomination 2,5,7 and 10 rupees. Similar private buses are either yellow or blue in colour. Buses with Green stripe have yellow number plates and have GL printed ahead of the number. These buses charge a flat rate of 10 rupees.

The DTC operates the world's largest fleet of environmentally friendly CNG buses. While not particularly high-tech, the DTC's natural gas-burning buses nevertheless pollute much less than the poorly designed and even more poorly maintained diesel-burning buses operated by most other State Road Transit Commissions (RTCs) in India. The buses are also much easier on the lungs of other road users as there is no cloud of carbon particles in the face of the unfortunate motorcyclist who sidles up next to a bus at an intersection. Directly, and indirectly, the gas-burning buses have also reduced, to some degree, the downward trend in Delhi's air quality and related illnesses.

Metro
A metro (mass rapid-transit system) built and managed by the Delhi Metro Rail Corporation is also under operation. There are three lines currently in operation. Line 1 runs east-west for 22kms on an elevated track between Rithala and Shahdara. Line 2 runs north-south for 11kms in an underground tunnel between Vishwa Vidyalaya and the Central Secretariat. Line 3, which opened on December 31, 2005 is 22.8 km long on elevated tracks and underground tunnel. The line runs between Indraprastha, Barakhamba Road and Dwarka.


Taxis
Though easily available, Taxis do not form an integral part of the public transportation system in Delhi. Most of the Taxis are operated by Delhi Transport Corporation, Indian Tourism Ministry and various private operators. The tourism ministry grants private companies permits to operate Taxis in the city. These Taxis, locally known as Tourist Taxis, provide better service than the Taxis run by the DTC. However, these Taxis are not metered unlike the DTC run Taxis and usually charge a higher fare. In order to hire a Taxi, one either has to go to the Taxi stand or telephone the Taxi service provider; they are not usually flagged from the street.

Railway connectivity
Delhi has a large and efficient railway network. The Indian Railways plays a crucial role in connecting Delhi with the rest of India. The railway system also helps connect major parts of the city and its suburbs. The major railway stations connected through the trains are Old Delhi, Hazrat Nizamuddin, New Delhi, Okhla, Pragati Maidan, Shahdara, Shakur Basti and Tilak Bridge. One of the major local trains is the one that operates between Palwal station and Shakur Basti station.



Airports
For both domestic and international connections, the city is served by Indira Gandhi International Airport (IGI). The airport is situated in the southwestern corner of the city. The airport operates two terminals: 1 and 2. Terminal 1 is the domestic terminal, while terminal 2 is the international terminal.

The international terminal has all modern facilities like Duty-Free Shopping, money exchange service and various other recreational facilities.

Besides the IGI Airport, two other airports are located within Delhi: The Palam Airport and the Safdarjung Airport. The Palam Airport was the first civilian airport in Delhi. However, it is now used by the Indian Air Force.