Thank you for taking the time to register your views about road pricing on the Downing Street website. This petition was posted shortly before we published the Eddington Study, an independent review of Britain's transport network. This study set out long-term challenges and options for our transport network.

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One thing I suspect we can all agree is that congestion is bad.  It's bad for business because it disrupts the delivery of goods and services. It affects people's quality of life. And it is bad for the environment. That is why tackling congestion is a key priority for any Government.

Congestion is predicted to increase by 25% by 2015.  This is being driven by economic prosperity. There are 6 million more vehicles on the road now than in 1997, and predictions are that this trend will continue. Part of the solution is to improve public transport, and to make the most of the existing road network. We have more than doubled investment since 1997, spending £2.5 billion this year on buses and over £4 billion on trains- helping to explain why more people are using them than for decades. And we're committed to sustaining this investment, with over £140 billion of investment planned between now and 2015. We're also putting a great deal of effort into improving traffic flows - for example, over 1000 Highways Agency Traffic Officers now help to keep motorway traffic moving.

But all the evidence shows that improving public transport and tackling traffic bottlenecks will not by themselves prevent congestion getting worse.  So we have a difficult choice to make about how we tackle the expected increase in congestion. This is a challenge that all political leaders have to face up to, and not just in the UK. For example, road pricing schemes are already in operation in Italy, Norway and in Singapore, and others, such as the Netherlands, are developing schemes. Towns and cities across the world are looking at road pricing as a means of addressing congestion.

One option would be to allow congestion to grow unchecked. Given the forecast growth in traffic, doing nothing would mean that journeys within and between cities would take longer, and be less reliable. I think that would be bad for businesses , individuals and the environment. And the costs on us all will be real - congestion could cost an extra £22 billion in wasted time in England by 2025, of which £10-12 billion would be the direct cost on businesses.

A second option would be to try to build our way out of congestion. We could, of course, add new lanes to our motorways, widen roads in our congested city centres, and build new routes across the countryside. Certainly in some places new capacity will be part of the story. That is why we are widening the M25, M1 and M62. But I think people agree that we cannot simply build more and more roads, particularly when the evidence suggests that traffic quickly grows to fill any new capacity.

Tackling congestion in this way would also be extremely costly, requiring substantial sums to be diverted from other services such as education and health, or increases in taxes. If I tell you that one mile of new motorway costs as much as £30m, you'll have an idea of the sums this approach would entail.