The M6 Toll motorway has been criticised after failing to considerably reduce traffic in the West Midlands.
A Highways Agency study has shown the motorway, which was opened in 2003 and cost £500 million to build and run, has been unable to cut congestion and has even generated extra car trips.
The report has also shown how traffic levels have nearly become the same as they were before the toll motorway was introduced.
Although jams are still common on the M6, the cost- free stretch of motorway has beaten the toll's peak-hour traffic rate.
Friends of the Earth's Chris Crean said the M6 Toll may be a massive generator, but it has been unable to relieve congestion. He said the Highway Agency's report showed the need for far wider pricing to ration the busiest roads at peak times.
In addition, new statistics have shown previous future traffic volume predictions have increased.
It is now believed traffic will grow to between 33 and 40 per cent by the end of the decade and by up to 70 per cent by 2025, and although traffic has nearly doubled since 1980, the road network has only grown by ten per cent.
The revelation of both the M6 Toll's failure and the statistics have added pressure for the introduction of national pricing of motorways, or even for the entire road network.