§ Mr. Warrenasked the Secretary of State for Transport what was the average length of the vehicles used in the 1950 formula that a minimum of 6,000 vehicles per day warrant consideration of a road being upgraded to a dual carriageway; what was the average length when the formula in 1961 was 8,500 vehicles per day; what was the average length when the formula in 1974 was raised to 17,000 vehicles per day; and what is the average length of vehicles using trunk roads in 1977.
§ Mr. HoramThe information requested by the hon. Member cannot be obtained. The average length of vehicles on the road was not a factor used in deriving the quoted levels of flow.