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.
خُب مساله اینه که٬ اعمال عوارض٬ اول به صورت آزمایشی در ژانویه انجام شد، و بعد یکبار دیگر در اواخر جولای و به دنبال یک رفراندوم لغو شد و مجدد در سال ۲۰۰۷ دوباره به راه افتاد٬ که البته یک موقعیت علمی شگفت‌انگیز هم بود.