1. The Road Transport Year Book 2011–12 (2013) Transport research wing, Govt. of India. http://morth.nic.in/sites/default/fles/other_fles/Road_Transport_Year_Book_2011_12.pdf. Accessed 7 Dec 2018
2. https://timesofindia.indiatimes.com/india/traffic-congestion-costs-four-major-indian-cities-rs-1-5-lakh-crore-a-year/articleshow/63918040.cms
3. Guerrini F (2014) Traffic congestion costs Americans $124 billion a year, report says. Forbes, October, 14
4. Economist T (2014) The cost of traffic jams. The Economist: London, UK
5. Webster FV (1958) Traffic signal settings. Road research technical. 39 London, UK