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Lupton, K. and Colwell, John and Bailey, M. (2002) Aspects of children's road crossing behaviour. Municipal Engineer, 151 (2). pp. 151-157. ISSN 0965-0903
Lupton, K. and Colwell, John (2001) Sometimes they don't stop, they just slow down. InRoads: Journal of the Institute of Road Safety Engineers, 21 (6).