Would toll roads reduce congestion?
David Cameron has called for an "urgent" increase in private investment to improve England's road network.
He said tolls for new roads were one option - alongside attracting more money from pension funds and other investors.
Since 2003 drivers have had to pay to use the M6 toll road in the West Midlands.
So is this the answer to reducing congestion? The BBC's correspondent Jeremy Cooke reports.
19 Mar 2012