During the trial, in 2006, traffic volumes within the controlled area fell by approximately 20%, while public transit ridership increased by some 6 to 9% (Pike, 2010). The initial public view of the system had been negative, with a disapproval rate of 55%, but following the trial period this had changed to 53% taking a positive view. This shift took place in a context where the area involved was extensive - some 34 square kilometres - and where a modest charge could nevertheless add up significantly: vehicles entering at one of 17 charging pints would pay up to 20 Swedish Krona SEK, roughly USD 3, with a daily maximum of 60 SEK and daily passes available.