ref: http://www.grandprix.com/ns/ns19064.html

The stories suggesting that Formula 1 has settled on the idea of a
street race in Delhi have been underscored by the news that F1 track
architect Hermann Tilke was in Delhi on Monday to take a look at the
streets of the city to figure out what would be best route for Formula 1
cars to use. This is likely to be in what is known as the Lutyens
Bungalow Zone, an area where Sir Edwin Lutyens laid out dignified houses
set back from wide tree-lined avenues. This now sits in the middle of
the high-rise sprawling modern city.

Once a route has been established the process of getting through the
Indian bureaucracy will begin.