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There are many options for transfer from the airport, including taxis, auto-rickshaw, bus and train.
Car rentals are provided by Avis, Hertz and Budget. You'll find their desks in the arrivals area. You will need an International Drivers' Permit to rent a car - but it really, really isn't recommended, especially if you've never driven in India before.
Airport facilities include ATMs, as well as currency exchange offices, a lost and found office, a Communication Centre located offering internet browsing, video phones and conferencing facilities. Other facilities include airline lounges, medical facilities, a duty-free shop, a few snack kiosks and vending machines, as well as basic access and facilities for disabled passengers.
There is short- and long-stay parking available for 500 cars and buses at Chennai International Airport. The parking lot is located right outside the terminal buildings.