Mr Hardcastle, of consultants KelloggBrown 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.
Saudi caterers contracted by KelloggBrown and Root, a subsidiary of Halliburton, an American oil-services company, have shipped in hundreds of Indian and Bangladeshi cooks to avoid, they say, the risk that Iraqis might poison the food.
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.