Delhi has around 70 flyovers, the most for any city in India. They were built to give cars direct and smooth transitions past railway crossings and traffic bottlenecks.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/flyovers-are-citys-new-choke-points
[2] http://admin.indiaenvironmentportal.org.in/category/author/neha-lalchandani
[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/traffic-accidents
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/two-wheelers
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/public-transport
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/centre-science-and-environment-cse
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/transport