An environmental campaign group has accused the Government of giving up on trying to curb traffic after new figures revealed levels rose again last year.
Provisional figures from the Department of Transport indicate estimated traffic levels rose by 0.7 per cent between the third quarters of 2004 and 2005.
While car and goods vehicle traffic remains almost unchanged, light van traffic was four-percent higher. Other motor vehicle traffic fell by three per cent.
Tony Bosworth, senior transport campaigner at Friends of the Earth, said: "The Government seems to have given up trying to do something about traffic levels but this is one of the key contributors to climate change.
" If the Government wants to meet its emissions target it must do something about the level of traffic on UK roads."
Traffic on motorways and on Rural A roads each rose by one per cent, while traffic on Urban A roads fell by two per cent. Traffic on Minor Rural roads and Minor Urban roads rose by three per cent and one per cent respectively.
The results are provisional estimates, subject to revision when final estimates are published in July, 2006.
The figures were released as Transport Secretary Alistair Darling announced new measures to make transport fuels greener by requiring five per cent of all UK fuel sold on UK forecourts to come from a renewable source by 2010.
Mr Darling said tackling climate change was " essential", adding: "Carbon savings could also increase in future years. This will help reduce the impact of transport on climate change."
Greenpeace executive director Stephen Tindale said: "Tony Blair will claim leadership, but he's not even meeting his EU obligations in this area.
" The Government is continuing to starve renewable energy of money. Tony Blair is failing on climate change."
The AA Motoring Trust said trying to price motorists out of cars did not work, as despite no reduction in the amount of traffic on the roads, UK motorists had seen record petrol price rises, to nearly £1 a litre.
Paul Watters, the trust's head of road and transport policy, said: "Both the Government and manufacturers are working towards the production of cleaner, even more economical cars which will benefit the motorist's pocket as well as the climate.
"More needs to be done to educate motorists of the benefits of switching to smaller and cleaner cars by providing them with the means to make easy comparisons between models and vehicle types."
A Transport Department spokesman said: "The Government is committed to cutting both congestion and emissions."