The TomTom Traffic Index is based on 19 trillion data points collected over nine years from 390 cities, according to the Dutch company.
Each city's congestion level was given a percentage score out of 100, with levels ranging from 66% in the most congested cities to 9% in the least.
TomTom defined the congestion level as the "increase in overall traffic times when compared to a free flow situation (an uncongested situation)."
Ralf-Peter Schaefer, VP TomTom Traffic, said in a statement that the traffic index is "designed to help drivers, cities and transport planners to understand traffic congestion and, most importantly, how to reduce it."
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Sam was a Senior Technology Reporter for Business Insider UK.Previously he worked as Startups and Innovation Editor for Techworld, based in London, and The Daily Mail. His writing has also appeared in The Telegraph, The Guardian, The Independent, City A.M., and elsewhere. He has also appeared on the BBC, Sky News, Al Jazeera, Channel 5, Reuters TV, and spoken on Russia Today and Shares Radio. In 2015, Sam was shortlisted for Technology Journalist of the Year by the UK Tech Awards and in 2016 Sam was nominated as one of the 30 young journalists to watch by MHP Communications.Follow Sam on Twitter: @sam_l_shead
