Mumbai was ranked as the most traffic-congested city in the world for the second straight year, while Delhi was at fourth place.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/traffic-index-2018-how-mumbai-congestion-was-measured-world-high
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/congestion
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mumbai
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/jakarta