Mr Hardcastle, of consultants Kellogg Brown and Root, said the main recommendation was for an "area-wide" charging scheme which would use satellite technology to monitor the journeys of all motorists and charge them per mile.

BBC: Tolls 'would curb M25 traffic jams'

Cheney, who was Halliburton's CEO in the 1990s, and nine others were charged with conspiracy and "distribution of gratification to public officials" in a long-running case involving the company and its Kellogg, Brown and Root subsidiary.

CNN: STORY HIGHLIGHTS