Some cities are notorious for extreme traffic jams. Find out which is the worst when it comes traffic congestion in North America.
TomTom has released the results of its latest Congestion Index, which measures traffic congestion in North American cities between July and September 2013. The fourth Congestion Index examines the congestion in 57 metropolitan areas with a population of more than 950,000. Take a look at the top 10 worst cities for traffic:
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