Traffic problems can cause long traffic jams, frustrating people who travel by car. Many cities, particularly the larger ones, struggle to cope with the overwhelming influx of traffic. The roads are congested with excessive cars, vans, and trucks. The TomTom "Traffic Index" is an annual report that ranks the cities across the globe that are facing the most extensive traffic jams. This ranking comprises almost 400 cities in 55 different countries. Brought to you by Tourism Review.