The average London commuter loses 83 hours a year to congestion – and many other cities are just as clogged. Here is an article with the worst victims. The Inrix traffic-data company has raided its archives to calculate the most congested cities in Europe and North America, as well as the total number of hours wasted in traffic. Inrix looked at its records of real-time traffic on every road segment during peak hours (6am-10am and 3pm-7pm, Monday through Friday) to see how the actual speed every 15 minutes related to how fast traffic would have been if the road were free-flowing. Inrix added together all the congested segments in a given city and averaged it to create a score for that city. To calculate the wasted minutes in traffic, the firm looked at an estimated typical commuter trip length, and the number of trips taken each year. Have a look at more pictures.