Ministers have promised a national road-pricing system to help ease the problem, but it is a decade away at least.

大臣们承诺通过全国性的道路收费系统来缓解这一问题，不过这至少是十年以后的事了。

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Once a road-pricing system was up and running, it would also provide valuable information about demand.

一旦道路计费系统形成并使用，还将提供有价值的需求信息。

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The study calls for a national system of road pricing, with the revenues used to offset cuts in fuel duty.

该研究呼吁建立一个全国性的道路收费系统，系统的收入用以抵销燃油税的削减。

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Even in highly disciplined Singapore, home of the most sophisticated road-pricing system in the world, citizens have had to be cajoled into accepting the latest flexible charging system with reductions on other motor taxes.

ECONOMIST: Road pricing

"We've got two policies, the first in terms of a national system of road pricing is that we have a debate ahead of a decision which lies some years away, " Mr Alexander said.

BBC: NEWS | UK | UK Politics | PM denies road toll 'stealth tax'

In Britain, such a system is being introduced as part of a road-pricing scheme for lorries on some motorways.

ECONOMIST: Clean machine