translation.en: 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.
translation.zh: 在伦敦，白天的时候需要征收额外的高峰路段费用， 晚上的时候就会有四分之一的降价。 现如今这项政策已经实施有四年了。