The following is the top 10 most congested North American cities, ranked by overall Congestion Level, between July and September 2012:

1. Los Angeles - 34%
   
2. Vancouver - 34%
   
3. San Francisco - 33%
   
4. Honolulu - 31%
   
5. Seattle - 27%
   
6. Toronto - 26%
   
7. New Orleans - 25%
   
8. San Jose - 25%
   
9. Montreal - 24%
   
10. Chicago - 24%