References and Further Reading

Department for Environment, Food & Rural Affairs. 2001. Digest of Environmental Statistics. http://www.defra.gov.uk/environment/statistics/des/intro.htm

Department for Transport. 2001. Road Traffic Statistics Great Britain 2001 Edition. The Stationery Office, London. http://www.transtat.dft.gov.uk/

Department for Transport. 2001. Transport Statistics Fact Sheets. http://www.transtat.dft.gov.uk/facts/index.htm

Peake S. 1994. Transport in Transition. Earthscan Publications, London.

Watkins L. H. 1991. Air Pollution from Road Vehicles. The Stationery Office, London.

European Conference of Ministers of Transport. 1995. Urban Travel and Sustainable Development. Organisation for Economic Co-operation and Development, Paris.