Prime minister David Cameron calls for more private sector involvement in British roads:
"We need to look at innovative approaches to the funding of our national roads - to increase investment to reduce congestion.
"Road tolling is one option – but we are only considering this for new, not existing, capacity.
"But we now need to be more ambitious. Why is it that other infrastructure – for example water - is funded by private sector capital through privately owned, independently regulated, utilities……but roads in Britain call on the public finances for funding.
"We need to look urgently at the options for getting large-scale private investment into the national roads network – from sovereign wealth funds, pension funds, and other investors."