The congestion charge he introduced two years ago has reduced traffic by 15% and increased speeds by 22% in central London without much damage to business.

他于两年前提出的塞车收费在伦敦中心区已经减少交通流量15%并提高速度22%，而且并没有给经济带来什么损害。

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Transport for London (TfL) said Johnson was still "minded" to scrap the western extension to the congestion charge zone and would make a final decision next spring.

大伦敦交通委员会表示，约翰逊仍然准备撤销伦敦市西的进城费收费区域，并将于明年春天作出最后的决定。

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London traffic remains sticky, despite the congestion charge.

尽管征收了交通拥护费，伦敦的交通仍然拥挤。

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It qualifies for lower car tax (unlike a diesel) and is also exempt from the London congestion charge.

BBC: NEWS | Programmes | Breakfast | Low carbon family: "Green" cars

There are already examples of tolls on the UK road network, such as the London congestion charge and at the Dartford Crossing.

BBC: Road pricing: More new roads could be funded by tolls

Some of the benefits are well-known, such as the lack of Vehicle Excise Duty and exemption from the London congestion charge, but it's becoming easier to charge up a Nissan LEAF on the move with more public charging points opening all the time.

ENGADGET: New Nissan Leaf comes to the UK with battery leasing option, extended range