1. Department for Transport, 1994. Road Accidents Great Britain 1995: The Casualty Report. TSO, London.
2. Department for Transport, 2002a. Design Manual Roads and Bridges, vol. 13, Section 1, Part 2. Department for Transport, London.
3. Department for Transport, 2002b. Road Accidents Great Britain 2001: The Casualty Report. TSO, London.
4. Department for Transport, 2003. Transport Statistics: Transport Trends 2002. Department for Transport, London.
5. Evaluations of road accident blackspot treatment: a case of the iron law of evaluation studies?;Elvik;Accid. Anal. Prev.,1997