Slide Show: 10 cities with the worst traffic in the world

TomTom /quotes/zigman/378580/delayed NL:TOM2 -1.26% , a maker of navigation and GPS systems, gathers data from users around the world to create a traffic index that shows congestion in urban areas. The index measures travel times throughout the day and during peak periods and compares them with travel times during non-congested periods. The difference is expressed as a total average percentage increase in travel time. Commuters in Dublin, for example, will spend 35% more time traveling during congested periods. Local roads, arterials and highways are taken into account. All data is based on actual GPS based measurements and for each city the sample size is expressed in total number of measured kilometers for the period.

These are the 10 cities in the world with the most congested traffic:

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