It's a chicken-and-egg situation. In the absence of a good public transport system, the city is dependent on private transport.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/41-parking-projects-planned-only-one-opened
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/public-transport
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/municipal-corporations
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/congestion
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi-development-authority-dda
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi-jal-board-djb
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/jawaharlal-nehru-national-urban-renewal-mission-jnnurm
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/habitat-and-urbanisation