Navigation company TomTom has published a list of the most congested cities in the world, which was made over nine years. 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)."
25. London, UK (40%)
24. Taipei, Taiwan (40%)
23. Tianjin, China (41%)
22. Shanghai, China (41%)
21. St Petersburg, Russia (41%)
20. Kaohsiung, Taiwan (41%)
19. Buenos Aires, Argentina (42%)
18. Shijiazhuang, China (42%)
17. Santiago de Chile, Chile (43%)
16. Hangzhou, China (43%)
15. Shenzhen, China (44%)
14. Guangzhou, China (44%)
13. Moscow, Russia (44%)
12. Los Angeles, USA (45%)
11. Changsha, China (45%)
10. Beijing, China (46%)
9. Tainan, Taiwan (46%)
8. Rio de Janeiro, Brazil (47%)
7. Chengdu, China (47%)
6. Istanbul, Turkey (49%)
5. Bucharest, Romania (50%)
4. Chongqing, China (52%)
3. Jakarta, Indonesia (58%)
2. Bangkok, Thailand (61%)
1. Mexico City, Mexico (66%)
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