english: In London, the day they turned the congestion pricing on, there was a 25 percent decrease in congestion overnight, and that's persisted for the four years in which they've been doing congestion pricing.
non_english: De dag dat ze in Londen  begonnen met spitsheffing, was er meteen 25 procent minder opstopping, en dat is zo gebleven in de vier jaar  van de spitsheffing.