And it cited the Scottish government's own assumptions that road pricing would be necessary.
MPC, says that her outfit hopes to make road pricing a bigger part of that debate.
Road pricing, adjusted for place and time, can, by contrast, be fixed precisely to reduce congestion.
His successor, Douglas Alexander, has since suggested that road pricing could be brought in within a decade.
BBC: NEWS | UK | UK Politics | PM denies road toll 'stealth tax'
The extension of hypothecation to road pricing is thus being described as part of a seamless process.
The government would also be looking into road pricing as another possible means of tackling congestion, he added.
BBC: NEWS | UK | England | Bradford | First car-share lane to be built
An online petition against a national road pricing plan by the last Labour government secured two million signatures.
Its chairman, David Begg, wants to explore whether road pricing could replace vehicle excise duty and petrol duties.
He wants a decision on whether or not road pricing should be implemented "during the course of this parliament".
BBC: NEWS | UK | UK Politics | At-a-glance: Road charge plans
The report comes ahead of publication by the government of an independent report on the feasibility of road pricing.
The green paper will raise the possibility that additional revenues could be raised by road pricing and parking charges.
Its chairman, Phillip Goodwin of London University's Transport Studies Unit, has written extensively on the politics of road pricing.
There is little doubt that Mr Begg will want to recommend road pricing.
For the small self-employed businessman road pricing will drive up his operating costs.
Depending on the precise question asked, national surveys show both support for and opposition to the idea of road pricing.
On the roads, congestion is almost certain to get worse (unless an economic slowdown curbs it) until nationwide road pricing is introduced.
Hostility towards road pricing might be understandable in other parts of America.
Any sensible solution will have to address the question of road pricing.
And recent polls show that if people are really convinced the revenues will go to public transport, they will even support road pricing.
Road pricing should be seen as making a key contribution to encourage motorists to trade out within an overall strategic objective of traffic reduction.
Critics claim that road pricing would merely displace traffic on to side roads, and that it would infringe privacy (because drivers' movements are recorded).
"Road pricing as an idea has got some merit, " he said.
BBC: NEWS | UK | UK Politics | PM denies road toll 'stealth tax'
Improving public transport is another frequently proposed alternative to road pricing.
Unfortunately, like its predecessor, this government appears to be keener on fiddling around the margins of the problem than on tackling fundamental issues such as road pricing.
The Greens said their "radical", but "realistic" plan for "cross-London road pricing scheme" would generate funding for step-free access, extending Tramlink and promoting cycling like in Amsterdam.
If road pricing is to be made politically acceptable, both the methods of charging and the use of the revenues must be easily understood and made totally transparent.
Road pricing, taxes on urban parking and other targeted measures would be far better at tackling the traffic jams that occur at particular times and in particular places.
That means parking controls, tough road pricing, or pedestrianisation.
"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'
The Transport Committee has its last session on the traffic management inquiry (how do you knock utility company heads together to limit holes in the road and curb congestion without road pricing etc...).
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