(11) - Road traffic, by type of vehicle: 1950-2004, UK Dept for environment food and rural affairs, <http://www.defra.gov.uk/environment/statistics/supp/spkf04.htm>- Accessed Nov. 07
Billion vehicle kilometres - UK
Car and taxi kilometres in UK - 1960 = 68 billion (of a 112 billion total), 2004 = 398 billion (of a 498 billion total). Road traffic, by type of vehicle: 1950-2004,