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.
Sagen er at trængselsafgiften blev indført først som en forsøgsordning i januar og så afskaffet igen sidst i juli, fulgt af en folkeafstemning, og så genindført igen i 2007, og det var selvfølgelig en stor mulighed for forskning.