Delhi has over 82 lakh registered motor vehicles. Of them, only 40,947 are buses.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/increase-buses-reduce-cars-road
[2] http://admin.indiaenvironmentportal.org.in/category/author/rumu-banerjee
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/buses
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cars
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicles
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi-transport-corporation-dtc
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/centre-science-and-environment-cse
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/public-transport
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/transport