One might analyze the data journey even more fine-grained when attending to more technical processing that mostly remains hidden. However, I'll stick with those sites that I found represented in the material and was able to imagine, which is still quite a lot!
Site 1: The cables
Site 2: The sensors
Site 3: The computer under the road
Site 4: The mobile radio towers and transfer servers
Site 5: Eco Counter Servers
Site 6: The dashboard view at the workplaces of city employees
Site 7: The servers that host the public dashboard
Site 8: Computers of website visitors
Site 9: The excel-sheets that constitute the data hub
In future: Site 10: Places in which the traffic model is later used?
Site 5: