In addition, as demonstrated by the example of the Stockholm congestion charge, the effectiveness of policies may increase when people are given the possibility to behave differently by testing the policy before deciding whether they want to support it Before the Stockholm congestion charge was introduced, people were offered the opportunity to try the system in addition to providing them with customised for different segments of population information. As a result of the trial, people changed behaviour and the change in attitude followed once the system was implemented permanently (Borjesson, Eliasson etai. Going from 'what's in it for me' to 'what's in it for us' should be appealing to people with its community spirit that is still valuable."