The TOMTOM Traffic Index measures traffic jams in cities around the world. Hamburg is ranked 61st in the world and 14th in Europe. Furthermore, it is only one percentage point below the most congested city in Germany, Cologne (March 6, 2017).
Bottelenecks can arise from one of many factors or even a combination of them. Some of the main factors are: number of road users, construction sites, timing of traffic lights, and special events such as demonstrations or sports events.