ACKNOWLEDGEMENTS
The author would like to thank the following:
The Science and Engineering Research Council for financial
support ;.
Professor A.D. May and Dr. D. van Vliet for their help and
advice throughout the project:
Dr. Dennis Robertson and his staff at the Urban Networks
Division of the Transport and Road Research Laboratory
for their help with the Leeds Survey using instrumented
vehicles:
Mrs. Patricia Hollick for her expert help with the typing:
Mrs. Judith Ellison for her very able technical assistance.