Stockholm city council (Miljöavgiftskansliet)
A panel postal survey to people in Stockholm county between 12 and 84 years old. The survey was a part of the congestion chargin trial. The survey in 2004 was conducted with the same sample. Observe that the modal split is for the entire county. 2% of modal split was "other mode". These trips are included under car trips. The population in Stockholm is for the county in 2005.