Acknowledgements
We are very grateful for the valuable time and support provided by Peter Dalton of the Joint Program in Transportation at the University of Toronto in providing travel data on Toronto in 1981 and 1991. We would also like to acknowledge the support of other agencies in Toronto who have provided data for this paper including, Juri Pill of the Toronto Transit Commission. Christina Yau of the Canadian Urban Transit Association, John Gartner of the Metropolitan Planning Department, Municipality of Metropolitan Toronto, Barbara Sorbara of the Public Transportation Office, Ontario Ministry of Transportation and Sylvia Davis of the Office for the Greater Toronto Area. We are also indebted to Joel Woodhull of METRO in Los Angeles (formerly the Southern California Rapid Transit District) for providing the Los Angeles transit data by planning sector and the density data. Finally, we would like to thank Mr Felix Laube, PhD student in ISTP for introducing the maps of LA and Toronto. We remain responsible for the way in which all the data provided to us are used in this paper. Partial financial support for the updating process from the University of Technology, Sydney is also gratefully acknowledged.