The Highways Agency has come under fire for failing to ease congestion on Britain's roads.

A new report from the National Audit Office criticises the executive branch of the Department for Transport.

Parliament's spending watchdog found the Agency has failed to put its most appropriate traffic management technology in all areas of the country and has only recently focused on congestion targets.

Auditor general Sir John Bourn said there is scope to ease congestion through policies other than building new roads.

"Road traffic congestion on our motorways and trunk roads is an enduring problem," he said.