§ Mr. Levitt
To ask the Secretary of State for the Environment, Transport and the Regions in how many fatal road accidents in the last three years over-tiredness has been assessed to be a contributory factor. 
§ Dr. Strang
Information is not at present collected on the causation of injury road accidents on a national basis. However, research commissioned by the Department estimated that tiredness is a principal contributory factor in around 10 per cent. of road accidents. Details of this research were published in TRL Report 169 (1995),Driver sleepiness as a factor in car and HGV accidents.