english: Well, the thing is that, the congestion charges, they were introduced first as a trial, so they were introduced in January and then abolished again at the end of July, followed by a referendum, and then they were reintroduced again in 2007, which of course was a wonderful scientific opportunity.
non_english: Stvar je u tome što su naplate za zagušenje najpre bile probne, tako da su uvedene u januaru, a onda ukinute krajem jula, nakon čega je bio referendum,  pa su ponovo uvedene u 2007. i to je stvorilo zlatnu priliku za naučnike.