It is a bit of a challenge getting around Delhi. There are some areas now served by the metro. But apart from that, autos (three-wheeled tuk tuks) are an absolute no-no, you end up paying more than what you would pay to a cab (black car with yellow roofs).
There is also a a radio cab service, which is also air-conditoned and reasonably clean. Available on call at 1920, 1929, 123.
www.megacabs.com/radio-taxi.html
www.delhilive.com/radio-cabs-launched-in-delhi
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